Chemistry the_central_science

ELEVENTH EDITION
CHEMISTRY
THE CENTRAL SCIENCE
Theodore L. Brown
Univenityot Illinois at Urbana-Champaign
H. Eugene LeMay, Jr.
UnivenityofNevada, Reno
Bruce E. Bursten
UnlvenilyofTennenee
Catherine J. Murphy
UnivHsityofSouthCarolina
With Contribution! from
Patrick Woodward
The Ohio State University
Upper S.tddle River, NJ 07458

Library of Congress Cataloging-in-Publication Data
Chemistry: the central science.-llth ed. I Theodore L. Brown .. [et al.].
p.cm.
Includes index.
ISBN 978-0-13-600617-6
1. Chemistry-Textbooks. I. Brown, Theodore L.
QD31.3.C43145 2009
540-dc22
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To our students, whose enthusiasm and curiosity
have often inspired us, and whose questions and
suggestions have sometimes taught us.

Brief Contents
vi
Preface xxiv
About the Authors XXXIII
1 Introduction: Matter and Measurement
2 Atoms, Molecules, and Ions 36
3 Stoichiometry: Calculations with Chemical Formulas and Equations 78
4 Aqueous Reactions and Solution Stoichiometry 118
5 Thermochemistry 164
6 Electronic Structure of Atoms 210
7 Periodic Properties of the Elements 254
8 Basic Concepts ofChemical Bonding 296
9 Molecular Geometry and Bonding Theories 340
10 Gases 392
11 Intermolecular Forces, Liquids, and Solids 436
12 Modern Materials 480
13 Properties of Solutions 526
14 Chemical Kinetics 572
15 Chemical Equilibrium 626
16 Acid-Base Equilibria 666
17 Additional Aspects of Aqueous Equilibria 718
18 Chemistry of the Environment 766
19 Chemical Thermodynamics 800
20 Electrochemistry 842
21 Nuclear Chemistry 892
22 Chemistry of the Nonmetals 930
23 Metals and Metallurgy 980
24 Chemistry of Coordination Compounds 1012
25 The Chemistry of Life: Organic and Biological Chemistry 1050
Appendices
A Mathematical Operations 1104
B Properties of Water 1111
C Thermodynamic Quantities for Selected Substances
at298.15 K (25 °C) 1112
D Aqueous Equilibrium Constants 1115
E Standard Reduction Potentials at25 oc 1117
Answers to Selected Exercises A-1
Answers to "Give It Some Thought" A-36
Glossary G-1
Photo/Art Credits P-1
Index l-1

Contents
1
Preface xxiv
About the Authors xxxm
Introduction: Matter and Measurement
1.1 THE STUDY OF CHEMISTRY 2
The Atomic and Molecular Perspective of Chemistry 2 Why Study
Chemistry? 3
1.2 CLASSIFICATIONS OF MATTER 4
States of Matter 4 Pure Substances 5 Elements 6 Compounds 6
Mixtures 8
1.3 PROPERTIES OF MATTER 9
Physical and Chemical Changes 10 Separation of Mixtures 11
1.4 UNITS OF MEASUREMENT 13
1
51 Units 13 Length and Mass 1 4 Temperature 15 Derived 51 Units 1 6
Volume 1 6 Density 17
1.5 UNCERTAINTY IN MEASUREMENT 2 0
Precision and Accuracy 20 Significant Figures 21 Significant Figures in
Calculations 23
1.6 DIMENSIONAL ANALYSIS 2 4
Using Two or More Conversion Factors 26 Conversions Involving Volume 27
SUMMARY AND KEY TERMS 29 KEY SKILLS 30
KEY EQUATIONS 30 VISUALIZING CONCEPTS 30
EXERCISES 31 ADDITIONAL EXERCISES 33
Chemistry Put to WOrk Chemistry and the Chemical Industry 4
A Closer wok The Scientific Method 13
Chemistry Put ro WOrk Chemistry in the News 18
Strategies in Chemistry Estimating Answers 26
Strategies in Chemistry The !mportance of Practice 28
2 Atoms, Molecules, and Ions 36
2.1 THE ATOMIC THEORY OF MATTER 38
2.2 THE DISCOVERY OF ATOMIC STRUCTURE 39
Cathode Rays and Electrons 39 Radioactivity 41
The Nuclear Atom 41
2.3 THE MODERN VIEW OF ATOMIC STRUCTURE 43
Atomic Numbers, Mass Numbers, and Isotopes 44
2.4 ATOMIC WEIGHTS 46
The Atomic Mass Scale 46 Average Atomic Masses 47
2.5 THE PERIODIC TABLE 48
2.6 MOLECULES AND MOLECULAR COMPOUNDS 5 1
Molecules and Chemical Formulas 52 Molecular and Empirical Formulas 52
Picturing Molecules 53
2.7 IONS AND IONIC COMPOUNDS 54
Predicting Ionic Charges 55 Ionic Compounds 56
2.8 NAMING INORGANIC COMPOUNDS 59
Names and Formulas of Ionic Compounds 59 Names and Formulas of Acids 64
Names and Formulas of Binary Molecular Compounds 65
vii

viii Contents
3
4
2.9 SOME SIMPLE ORGANIC COMPOUNDS 66
Alkanes 66 Some Derivatives of Alkanes 66
VISUALIZING CONCEPTS 69 EXERCISFS 70
ADDITIONAL EXERCISFS 75
A Clour Ltlolr Basic Forces 45
A Closer Ltlok The Mass Spectrometer 48
A Closer Ltlok Glenn Seaborg and Seaborgium 51
Chemistry andLife Elements Required by Living Organisms 57
Strategies in Chemistry Pattern Recognition 58
Stoichiometry: Calculations with Chemical
Formulas and Equations 78
3.1 CHEMICAL EQUATIONS 80
Balancing Equations 80 Indicating the States of Reactants and Products 83
3.2 SOME SIMPLE PATTERNS OF CHEMICAL REACTIVITY 84
Combination and Decomposition Reactions 84 Combustion in Air 86
3.3 FORMULA WEIGHTS 87
Formula and Molecular Weights 87 Percentage Composition from Formulas 88
3.4 AVOGADRO'S NUMBER AND THE MOLE 89
Molar Mass 91 lnterconverting Masses and Moles 93 lnterconverting
Masses and Numbers of Particles 94
3.5 EMPIRICAL FORMULAS FROM ANALYSES 95
Molecular Formula from Empirical Formula 96 Combustion Analysis 97
3.6 QUANTITATIVE INFORMATION FROM BALANCED
EQUATIONS 98
3.7 LIMITING REACTANTS 102
Theoretical Yields 1 05
EXERCISFS 109 ADDITIONAL EXERCISFS ll5
INTEGRATIVE EXERCISFS 116
Strategies in Chemistry Problem Solving 89
Chemistry andLife Glucose Monitoring 102
Strategies in Chemistry How to Take a Test 106
Aqueous Reactions and Solution
Stoichiometry 118
4.1 GENERAL PROPERTIES OF AQUEOUS SOLUTIONS 120
Electrolytic Properties 1 20 Ionic Compounds in Water 1 20 Molecular
Compounds in Water 1 22 Strong and Weak Electrolytes 1 22
4.2 PRECIPITATION REACTIONS 124
Solubility Guidelines for Ionic Compounds 1 24 Exchange (Metathesis)
Reactions 1 26 Ionic Equations 1 27
4.3 ACID-BASE REACTIONS 128
Acids 1 29 Bases 1 29 Strong and Weak Acids and Bases 1 30
Identifying Strong and Weak Electrolytes 1 31 Neutralization Reactions and
Salts 1 32 Acid-Base Reactions with Gas Formation 1 34
4.4 OXIDATION-REDUCTION REACTIONS 135
Oxidation and Reduction 1 36 Oxidation Numbers 1 37
Oxidation of Metals by Acids and Salts 1 38 The Activity Series 1 40

4.5 CONCENTRATIONS OF SOLUTIONS 1 42
Molarity 146 Expressing the Concentration of an Electrolyte 145
lnterconverting Molarity, Moles, and Volume 145 Dilution 146
4.6 SOLUTION STOICHIOMETRY AND CHEMICAL ANALYSIS 149
Titrations 150
SUMMARY AND KEYTERMS 154 KEY SKiLLS 155
KEY EQUATIONS 155 VISUALIZiNG CONCEPTS 156
INTEGRATIVE EXERCISES 162
Chemistry Put to Vc>rk Antacids 135
A CkJSer Look The Aura of Gold 143
Strategies in Chemistry Analyzing Chemical Reactions 143
Chemistry andLife DrinkingToo MuchWater Can KillYou 147
5 Thermochemistry 164
5.1 THE NATURE OF ENERGY 166
Kinetic Energy and Potential Energy 166 Units of Energy 167 System and
Surroundings 168 Transferring Energy: Work and Heat 168
5.2 THE FIRST LAW OF THERMODYNAMICS 170
Internal Energy 170 Relating llE to Heat and Work 171 Endothermic and
Exothermic Processes 172 State Functions 1 72
5.3 ENTHALPY 1 74
5.4 ENTHALPIES OF REACTION 177
5.5 CALORIMETRY 179
Heat Capacity and Specific Heat 179 Constant-Pressure Calorimetry 182
Bomb Calorimetry (Constant-Volume Calorimetry) 183
5.6 HESS'S LAW 184
5.7 ENTHALPIES OF FORMATION 188
Using Enthalpies of Formation to Calculate Enthalpies of Reaction 190
5.8 FOODS AND FUELS 1 93
Foods 193 Fuels 195 Other Energy Sources 197
SUMMARY AND KEY TERMS 199 KEY SKiLLS 200
KEYEQUATIONS 201 VISUALIZING CONCEPTS 201
EXERCISES 202 ADDITIONALEXERCISES 207
A CU.ser Look Energy, Enthalpy, and P-VW ork 176
Strategies in Chemistry Using Enthalpy as a Guide 180
Chemistry atldLife The Regulation of Human Body Temperature 185
01emistry Put to Vc>rk The Hybrid Car 196
6 Electronic Structure ofAtoms
6.1 THE WAVE NATURE OF LIGHT 212
6.2 QUANTIZED ENERGY AND PHOTONS 215
2 10
Hot Objects and the Quantization of Energy 215 The Photoelectric Effect
and Photons 216
6.3 LINE SPECTRA AND THE BOHR MODEL 218
Line Spectra 2 18 Bohr's Model 2 19 The Energy States o f the Hydrogen
Atom 220 Limitations of the Bohr Model 222
6.4 THE WAVE BEHAVIOR OF MATTER 222
The Uncertainty Principle 223
6.5 QUANTUM MECHANICS AND ATOMIC ORBITALS 224
Orbitals and Quantum Numbers 226
Contents ix

x Contents
6.6 REPRESENTATIONS OF ORBITALS 228
The s Orbitals 228 The p Orbitals 231 The d and f Orbitals 232
6.7 MANY-ELECTRON ATOMS 232
Orbitals and Their Energies 232 Electron Spin and the Pauli Exclusion
Principle 233
6.8 ELECTRON CONFIGURATIONS 234
Hund's Rule 235 Condensed Electron Configurations 237
Transition Metals 238 The Lanthanides and Actinides 239
6.9 ELECTRON CONFIGURATIONS AND THE PERIODIC TABLE 240
Anomalous Electron Configurations 243
SUMMARY AND KEYTERMS 244 KEYSKILLS 245
A Clo1er Look The Speed of Light 214
A Closer Look Measurement and the Uncertainty Principle 225
A Closer Look Probability Density and Radial Probability Functions 230
A Closer Look Experimental Evidence for Electron Spin 234
Chemistry andLife Nuclear Spin and Magnetic Resonance Imaging 236
7 Periodic Properties of the Elements 254
7.1 DEVELOPMENT OF THE PERIODIC TABLE 256
7.2 EFFECTIVE NUCLEAR CHARGE 257
7.3 SIZES OF ATOMS AND IONS 259
Periodic Trends in Atomic Radii 262 PeriodicTrends in Ionic Radii 263
7.4 IONIZATION ENERGY 264
Variations in Successive Ionization Energies 266 Periodic Trends in First
Ionization Energies 267 Electron Configurations of Ions 268
7.5 ELECTRON AFFINITIES 270
7.6 METALS, NONMETALS, AND METALLOIDS 271
Metals 272 Nonmetals 274 Metalloids 276
7.7 GROUP TRENDS FOR THE ACTIVE METALS 276
Group 1A: The Alkali Metals 276 Group 2A: The Alkaline Earth Metals 279
7.8 GROUP TRENDS FOR SELECTED NONMETALS 281
Hydrogen 281 Group 6A: The Oxygen Group 282 Group 7A:
The Halogens 283 Group SA: The Noble Gases 284
SUMMARY AND KEYTERMS 286 KEY SKILLS 287
KEY EQUATIONS 287 VISUAliZING CONCEPTS 288
A Closer Look Effective Nuclear Charge 260
Chemistry andLife Ionic Size Makes a Big Difference 265
Chemistry andLife The Improbable Development of Lithium Drugs 280
8 Basic Concepts of Chemical Bonding
8.1 CHEMICAL BONDS, LEWIS SYMBOLS, AND
THE OCTET RULE 298
Lewis Symbols 298 The Octet Rule 299
8.2 IONIC BONDING 299
296
Energetics of Ionic Bond Formation 301 Electron Configurations of Ions of
the S· and p-Biock Elements 302 Transition-Metal Ions 303

9
8.3 COVALENT BONDING 305
Lewis Structures 30S Multiple Bonds 307
8.4 BOND POLARITY AND ELECTRONEGATIVITY 307
Electronegativity 30B Electronegativity and Bond Polarity 308
Dipole Moments 310 Differentiating Ionic and Covalent Bonding 312
8.5 DRAWING LEWIS STRUCTURES 314
Formal Charge 316
8.6 RESONANCE STRUCTURES 319
Resonance in Benzene 321
8.7 EXCEPTIONS TO THE OCTET RULE 322
Odd Number of Electrons 322 Less than an Octet of Valence Electrons 322
More than an Octet of Valence Electrons 323
8.8 STRENGTHS OF COVALENT BONDS 325
Bond Enthalpies and the Enthalpies of Reactions 326
Bond Enthalpy and Bond Length 329
SUMMARY AND KEY TERMS 331 KEYSKILLS 332
A ChuFr Loolr Calculation of Lattice Energies: The Bom-Haber Cycle 304
A GoserLook Oxidation Numbers, Formal Charges, andActual Partial Charges 318
GJtmJistry Put to Work Explosives and Alfred Nobel 328
Molecular Geometry and Bonding
Theories 340
9.1 MOLECULAR SHAPES 342
9.2 THE VSEPR MODEL 344
The Effect of Nonbonding Electrons and Multiple Bonds on
Bond Angles 348 Molecules with Expanded Valence Shells 349
Shapes of Larger Molecules 352
9.3 MOLECULAR SHAPE AND MOLECULAR POLARITY 353
9.4 COVALENT BONDING AND ORBITAL OVERLAP 355
9.5 HYBRID ORBITALS 357
sp Hybrid Orbitals 357 sp
2
and sp
3
Hybrid Orbitals 358
Hybridization Involving dOrbitals 360 Hybrid Orbital Summary 360
9.6 MULTIPLE BONDS 362
Resonance Structures, Delocalization, and 7T Bonding 365
General Conclusions 368
9.7 MOLECULAR ORBITALS 368
The Hydrogen Molecule 368 Bond Order 370
9.8 SECOND-ROW DIATOMIC MOLECULES 371
Molecular Orbitals for Li2 and Be2 371 Molecular Orbitals from
2p Atomic Orbitals 372 Electron Configurations for B2 Through Ne2 375
Electron Configurations and Molecular Properties 376
Heteronuclear Diatomic Molecules 379
SUMMA RY AND KEY TERMS 381 KEY SKILLS 383
Chemistry and Life The Chemistry of Vision 367
A C/osFr Look Phases in Atomic and Molecular Orbitals 373
Chemistry Put to W<>rk Orbitals and Energy 380
Contents xi

xii Contents
1 Q Gases 392
11
10.1 CHARACTERISTICS OF GASES 394
10.2 PRESSURE 395
Atmospheric Pressure and the Barometer 395
10.3 THE GAS LAWS 398
The Pressure-Volume Relationship: Boyle's Law 399 The Temperature
Volume Relationship: Charles's Law 400 The Quantity-Volume Relationship:
Avogadro's Law 400
10.4 THE IDEAL-GAS EQUATION 402
Relating the Ideal-Gas Equation and the Gas Laws 404
10.5 FURTHER APPLICATIONS OF THE IDEAL-GAS
EQUATION 406
Gas Densities and Molar Mass 406 Volumes of Gases in Chemical
Reactions 408
10.6 GAS MIXTURES AND PARTIAL PRESSURES 410
Partial Pressures and Mole Fractions 411 Collecting Gases over Water 412
10.7 KINETIC-MOLECULAR THEORY 41 4
Distributions of Molecular Speed 414 Application to the Gas Laws 41S
10.8 MOLECULAR EFFUSION AND DIFFUSION 417
Graham's Law of Effusion 418 Diffusion and Mean Free Path 419
10.9 REAL GASES: DEVIATIONS FROM IDEAL BEHAVIOR 420
The van der Waals Equation 422
Chemistry andLife Blood Pressure 398
Strategies in Chemistry Calculations Involving ManyVariables 404
ChemistryPut to Work Gas Pipelines 409
A Closer Look The Ideal-Gas Equation 416
Chemistry Put to Work Gas Separations 420
Intermolecular Forces, Liquids,
and Solids 436
11.1 A MOLECULAR COMPARISON OF GASES, LIQUIDS, AND
SOLIDS 438
11.2 INTERMOLECULAR FORCES 439
ion-Dipole Forces 440 Dipole-Dipole Forces 440 London Dispersion
Forces 441 Hydrogen Bonding 443 Comparing Intermolecular
Forces 446
11.3 SOME PROPERTIES OF LIQUIDS 447
Viscosity 447 Surface Tension 448
11.4 PHASE CHANGES 449
Energy Changes Accompanying Phase Changes 449 Heating Curves 450
Critical Temperature and Pressure 452
11.5 VAPOR PRESSURE 453
Explaining Vapor Pressure on the Molecular Level 454 Volatility, Vapor
Pressure, and Temperature 454 Vapor Pressure and Boiling Point 455
11.6 PHASE DIAGR AMS 456
The Phase Diagrams of H20 and C02 457

11.7 STRUCTURES OF SOLIDS 458
Unit Cells 460 The Crystal Structure of Sodium Chloride 461
Close Packing of Spheres 463
11.8 BONDING IN SOLIDS 464
Molecular Solids 464 Covalent-Network Solids 466 Ionic Solids 467
Metallic Solids 467
VISUALIZING CONCEPTS 471 EXERCISES 472
ADDITIONAL EXERCISES 477 INTEGRATIVE EXERCISES 478
Chemistry Put to WOrk Supercritical Fluid Extraction 453
A Closer Look The Clausius-Clapeyron Equation 456
A Gt>ser Look X-Ray Diffraction by Crystals 465
A CloserLook TheThird Form of Carbon 468
12 Modern Materials 480
12.1 CLASSES OF MATERIALS 482
12.2 ELECTRONIC STRUCTURE OF MATERIALS 482
12.3 SEMICONDUCTORS 484
Semiconductor Doping 488 The Silicon Chip 489 Solar Energy
Conversion 489 Semiconductor Light-Emitting Diodes 492
12.4 CERAMICS 493
Applications of Ceramics 494 Making Ceramics 494
12.5 SUPERCONDUCTORS 495
Ceramic Superconductors 497
12.6 POLYMERS AND PLASTICS 499
Making Polymers 499 Structure and Physical Properties of Polymers 502
12.7 BIOMATERIALS 505
Characteristics of Biomaterials 507 Polymeric Biomaterials 507
Heart Repair 508 Vascular Grafts 509 Artificial Tissue 509
12.8 LIQUID CRYSTALS 510
Types of Liquid Crystalline Phases 51 1
12.9 NANOMATERIALS 513
Semiconductors on the Nanoscale 513 Metals on the Nanoscale 515
Carbon Nanotubes 515
ADDITIONALEXERCISES 524 INTEGRATIVEEXERCISES 525
A Clt>serLook TheTransistor 490
Chemistry Put to WOrk Cell Phone Tower Range 498
Chemistry Put to WOrk Recycling Plastics 501
Chemistry Put to Work Toward the Plastic Car 506
Chemistry Put to WOrk Liquid Crystal Displays 513
13 Properties of Solutions
13.1 THE SOLUTION PROCESS 528
526
The Effect of Intermolecular Forces 528 Energy Changes and Solution
Formation 529 Solution Formation, Spontaneity, and Entropy 531
Solution Formation and Chemical Reactions 533
13.2 SATURATED SOLUTIONS AND SOLUBILITY 534
13.3 FACTORS AFFECTING SOLUBILITY 535
Solute-Solvent Interactions 536 Pressure Effects 539
Temperature Effects 541
Contents xiii

xiv Contents
13.4 WAYS OF EXPRESSING CONCENTRATION 542
Mass Percentage, ppm, and ppb 542 Mole Fraction, Molarity,
and Molality 543 Conversion of Concentration Units 544
13.5 COLLIGATIVE PROPERTIES 546
Lowering the Vapor Pressure 546 Boiling-Point Elevation 549
Freezing-Point Depression 550 Osmosis 551 Determination of
Molar Mass 555
13.6 COLLOIDS 556
Hydrophilic and Hydrophobic Colloids 557 Removal of Colloidal
Particles 560
SUMMARYAND KEY TERMS 561 KEY SKILLS 562
A Closer IAolt Hydrates 533
Chemistry andLife Fat- and Water-SolubleVitamins 538
Chemistry andLife Blood Gases and Deep-Sea Diving 540
A Ooser IAok Ideal Solutions withTwo or MoreVolatile Components 548
A Ooser Look Colligative Properties of Electrolyte Solutions 554
Chemistry andLife Sickle-Cell Anemia 559
14 Chemical Kinetics 572
14.1 FACTORS THAT AFFECT REACTION RATES 574
14.2 REACTION RATES 575
Change of Rate with lime 577 Instantaneous Rate 577 Reaction Rates
and Stoichiometry 578
14.3 THE RATE LAW: THE EFFECT OF CONCENTRATION
ON RATE 580
Reaction Orders: The Exponents in the Rate Law 581 Units of
Rate Constants 583 Using Initial Rates to Determine Rate Laws 584
14.4 THE CHANGE OF CONCENTRATION WITH TIME 585
First-Order Reactions 586 Second-Order Reactions 588
Half-life 589
14.5 TEMPERATURE AND RATE 591
The Collision Model 592 The Orientation Factor 592
Activation Energy 592 The Arrhenius Equation 594 Determining the
Activation Energy 595
14.6 REACTION MECHANISMS 597
Elementary Reactions 597 Multistep Mechanisms 598 Rate Laws for
Elementary Reactions 599 The Rate-Determining Step for a Multistep
Mechanism 600 Mechanisms with a Slow Initial Step 601 Mechanisms
with a Fast Initial Step 602
14.7 CATALYSIS 605
Homogeneous Catalysis 605 Heterogeneous Catalysis 606
Enzymes 608
A Closer Look Using Spectroscopic Methods to Measure Reaction Rates 580
Chemistry Put to WOrk Methyl Bromide in the Atmosphere 590
G1emistry Put to WOrk Catalytic Converters 608
Chemistry andLife Nitrogen Fixation and Nitrogenase 610

15 Chemical Equilibrium 626
15.1 THE CONCEPT OF EQUILIBRIUM 628
15.2 THE EQUILIBRIUM CONSTANT 630
Evaluating Kc 632 Equilibrium Constants in Terms of Pressure, Kp 633
Equilibrium Constants and Units 635
15.3 INTERPRETING AND WORKING WITH EQUILIBRIUM
CONSTANTS 635
The Magnitude of Equilibrium Constants 635 The Direction of the
Chemical Equation and K 636 Relating Chemical Equations and
Equilibrium Constants 637
15.4 HETEROGENEOUS EQUILIBRIA 639
15.5 CALCULATING EQUILIBRIUM CONSTANTS 641
15.6 APPLICATIONS OF EQUILIBRIUM CONSTANTS 644
Predicting the Direction of Reaction 644 Calculating Equilibrium
Concentrations 645
15.7 LE CHATELIER'S PRINCIPLE 648
Change in Reactant or Product Concentrations 649 Effects of Volume and
Pressure Changes 649 Effect of Temperature Changes 651 The Effect of
Catalysts 654
INTEGRAITVE EXERCISES 664
Chemistry Put to "WOrk Haber Process 631
Chemistry Put to "WOrk Controlling Nitric Oxide Emissions 656
16 Acid-Base Equilibria 666
16.1 ACIDS AND BASES: A BRIEF REVIEW 668
16.2 BR0NSTED-LOWRY ACIDS AND BASES 668
The W lon in Water 669 Proton-Transfer Reactions 669 Conjugate
Acid-Base Pairs 670 Relative Strengths of Acids and Bases 672
16.3 THE AUTOIONIZATION OF WATER 673
The lon Product of Water 674
16.4 THE pH SCALE 675
pOH and Other "p" Scales 678 Measuring pH 678
16.5 STRONG ACIDS AND BASES 679
Strong Acids 679 Strong Bases 680
16.6 WEAK ACIDS 681
Calculating K0 from pH 682 Percent Ionization 683 Using K0 to Calculate
pH 684 Polyprotic Acids 688
16.7 WEAK BASES 690
Types of WeakBases 692
16.8 RELATIONSHIP BETWEEN K. AND Kb 693
16.9 ACID-BASE PROPERTIES OF SALT SOLUTIONS 695
An Anion's Ability to React with Water 696 A Cation's Ability to React with
Water 696 Combined Effect of Cation and Anion in Solution 697
16.10 ACID-BASE BEHAVIOR AND CHEMICAL STRUCTURE 699
Factors That Affect Acid Strength 699 Binary Acids 699
Oxyacids 700 Carboxylic Acids 702
16.11 LEWIS ACIDS AND BASES 704
Hydrolysis of Metalions 705
Contents xv

xvi Contents
17
SUMMARYAND KEYTERMS 707 KEY SKILlS 708
Cbemistry Put to WOrk Amines and Amine Hydrochlorides 694
Cbemistry andLife The Amphiprotic Behavior ofAmino Acids 703
Additional Aspects
ofAqueous Equilibria 718
17.1 THE COMMON-ION EFFECT 720
17.2 BUFFERED SOLUTIONS 723
Composition and Action of Buffered Solutions 723 Calculating the pH of a
Buffer 724 Buffer Capacity and pH Range 726 Addition of Strong Acids
or Bases to Buffers 727
17.3 ACID-BASE TITRATION$ 730
Strong Acid-Strong Base Titrations 730 Weak Acid-Strong
Base Titrations 733 Titrations of Polyprotic Acids 737
17.4 SOLUBILITY EQUILIBRIA 737
The Solubility-Product Constant, Ksp 738 Solubility and K'P 738
17.5 FACTORS THAT AFFECT SOLUBILITY 741
Common-ion Effect 741 Solubility and pH 742 Formation of Complex
Ions 745 Amphoterism 748
17.6 PRECIPITATION A ND SEPA RATION OF IONS 750
Selective Precipitation of Ions 751
17.7 QUALITATNE A NALYSIS FOR METALLIC ELEMENTS 753
SUMMARY AND KEYTERMS 756 KEY SKILlS 757
Cbemistry andLife Blood as a BufferedSolution 729
A Closer LDDk Limitations ofSolubility Products 741
Chemistry andLife Sinkholes 744
Cbemistry andLife Tooth Decay and Fluoridation 747
18 Chemistry of the Environment 766
18.1 EARTH'S ATMOSPHERE 768
Composition of the Atmosphere 769
18.2 OUTER REGIONS OF THE ATMOSPHERE 770
Photodissociation 770 Photoionization 772
18.3 OZONE IN THE UPPER ATMOSPHERE 772
Depletion of the Ozone Layer 774
18.4 CHEMISTRY OF THE TROPOSPHERE 775
Sulfur Compounds and Acid Rain 776 Carbon Monoxide 778
Nitrogen Oxides and Photochemical Smog 779 Water Vapor, Carbon
Dioxide, and Climate 780
18.5 THE WORLD OCEAN 783
Seawater 783 Desalination 784
18.6 FRESHWATER 785
Dissolved Oxygen and Water Quality 786 Treatment of Municipal Water
Supplies 786

18.7 GREEN CHEMISTRY 788
Solvents and Reagents 789 Other Processes 790 The Challenges of Water
Purification 790
ADDI TIONAL EXERCISES 797 INTEGRATIVE EXERCISES 798
A CbJser 1-oolt Other Greenhouse Gases 782
A CbJser Look Water Softening 788
1 9 Chemical Thermodynamics 800
19.1 SPONTANEOUS PROCESSES 802
Seeking a Criterion for Spontaneity 804 Reversible and
Irreversible Processes 804
19.2 ENTROPY AND THE SECOND LAW
OF THERMODYNAMICS 806
Entropy Change 806 6.5 for Phase Changes 807 The Second Law of
Thermodynamics 808
19.3 THE MOLECULAR INTERPRETATION OF ENTROPY 809
Molecular Motions and Energy 809 Boltzmann's Equation
and Microstates 81 0 Making Qualitative Predictions About 6.5 813
The Third Law of Thermodynamics 816
19.4 ENTROPY CHANGES IN CHEMICAL REACTIONS 817
Entropy Changes in the Surroundings 81 8
19.5 GIBBS FREE ENERGY 819
Standard Free-Energy of Formation 822
19.6 FREE ENERGY AND TEMPERATURE 824
19.7 FREE ENERGY AND THE EQUILIBRIUM CONSTANT 826
EXERCISES 834 ADDI TIONAL EXERCISES 839
A Closer Look The Entropy Change when a Gas Expands Isothermally 808
A Clos,.,-1-oolt Entropy and Probability 812
Chemistry andLife Entropy and Life 815
A Closer1-ooA What's"Free"about Free Energy? 822
Chemistry andLife Driving Nonspontaneous Reachons 830
2Q Electrochemistry 842
20.1 OXIDATION STATES AND OXIDATION-REDUCTION
REACTIONS 844
20.2 BALANCING OXIDATION-REDUCTION EQUATIONS 846
Half-Reactions 846 Balancing Equations by the Method
of Half-Reactions 846 Balancing Equations for Reactions Occurring
in Basic Solution 849
20.3 VOLTAIC CELLS 851
A Molecular View of Electrode Processes 854
20.4 CELL EMF UNDER STANDARD CONDITIONS 855
Standard Reduction (Half-Cell) Potentials 856 Strengths of Oxidizing and
Reducing Agents 860
20.5 FREE ENERGY AND REDOX REACTIONS 862
EMF and 6.G 863
Contents xvii

xviii Contents
20.6 CELL EMF UNDER NONSTANDARD CONDITIONS 865
The Nernst Equation 865 Concentration Cells 867
20.7 BATTERIES AND FUEL CELLS 870
20.8
Lead-Acid Battery 871 Alkaline Battery 872
Metal-Hydride, and Lithium-ion Batteries 872
CORROSION 874
Nickel-Cadmium, Nickel·
Hydrogen Fuel Cells 873
Corrosion of Iron 874 Preventing the Corrosion of Iron 875
20.9 ELECTROLYSIS 876
Quantitative Aspects of Electrolysis 878 Electrical Work 879
EXERCISES 884 ADDITIONALEXERCISES 889
Chemistry andLife Heartbeats and Electrocardiography 868
Cbemistry Put to WOrk Direct Methanol Fuel Cells 874
21 Nuclear Chemistry 892
21.1 RADIOACTIVITY 894
Nuclear Equations 895 Types of Radioactive Decay 896
21.2 PATTERNS OF NUCLEAR STABILITY 898
Neutron-to-Proton Ratio 898 Radioactive Series 900
Further Observations 901
21.3 NUCLEAR TRANSMUTATIONS 901
Accelerating Charged Particles 902 Using Neutrons 903
Transuranium Elements 903
21.4 RATES OF RADIOACTIVE DECAY 903
Radiometric Dating 905 Calculations Based on Half-life 905
21.5 DETECTION OF RADIOACTIVIT Y 908
Radiotracers 91 0
21.6 ENERG Y CHANGES IN NUCLEAR REACTIONS 911
Nuclear Binding Energies 91 2
21.7 NUCLEAR POWER: FISSION 913
Nuclear Reactors 91 5
21.8 NUCLEAR POWER: FUSION 918
21.9 RADIATION IN THE ENVIRONMENT AND LIVING SYSTEMS 919
Radiation Doses 920 Radon 921
Chemistry andLife Medical Applications of Radiotracers 910
A Closer Look The Dawning of the Nuclear Age 915
Cbemistry Put to WOrk Environmental Applications of Radioisotopes 921
Cbemistry andLife Radiation Therapy 922
22 Chemistry of the Nonmetals
22.1 GENERAL CONCEPTS: PERIODIC TRENDS
AND CHEMICAL REACTIONS 932
Chemical Reactions 933
22.2 HYDROGEN 935
930
Isotopes of Hydrogen 935 Properties of Hydrogen 936 Preparation of
Hydrogen 936 Uses of Hydrogen 937 Binary Hydrogen Compounds 937

22.3 GROUP SA: THE NOBLE GASES 938
Noble-Gas Compounds 939
22.4 GROUP ?A: THE HALOGENS 940
Properties and Preparation of the Halogens 940 Uses of the Halogens 941
The Hydrogen Halides 942 lnterhalogen Compounds 943 Oxyacids and
Oxyanions 943
22.5 OXYGEN 944
Properties of Oxygen 944 Preparation of Oxygen 944 Uses of Oxygen
945 Ozone 945 Oxides 946 Peroxides and Superoxides 948
22.6 THE OTHER GROUP 6A ELEMENTS: S, Se, Te, AND Po 948
General Characteristics of the Group 6A Elements 949 Occurrence and
Preparation of S, Se, and Te 949 Properties and Uses of Sulfur,
Selenium, and Tellurium 949 Su�ides 950 Oxides, Oxyacids, and
Oxyanions of Sulfur 950
22.7 NITROGEN 952
Properties of Nitrogen 952 Preparation and Uses of Nitrogen 952
Hydrogen Compounds of Nitrogen 953 Oxides and Oxyacids
of Nitrogen 954
22.8 THE OTHER GROUP 5A ELEMENTS: P, As, Sb, AND Bi 956
General Characteristics of the Group SA Elements 956 Occurrence, Isolation,
and Properties of Phosphorus 957 Phosphorus Halides 957
Oxy Compounds of Phosphorus 958
22.9 CARBON 960
Elemental Forms of Carbon 961 Oxides of Carbon 962 Carbonic Acid
and Carbonates 963 Carbides 964 Other Inorganic Compounds of
Carbon 965
22.10 THE OTHER GROUP 4A ELEMENTS: Si, Ge, Sn, AND Pb 965
General Characteristics of the Group 4A Elements 965
Preparation of Silicon 966 Silicates 966 Glass 968
22.11 BORON 969
Occurrence and
Silicones 969
A Oosu Look The Hydrogen Economy 937
Chemistry andLife How Much Perchlorate Is Too Much? 944
Chemistry andLife Nitroglycerin and Heart Disease 956
Chemistry andLife Arsenic in DrinkingWater 960
Chemistry Put to Work Carbon Fibers and Composites 962
23 Metals and Metallurgy 980
23.1 OCCURRENCE AND DISTRIBUTION OF METALS 982
Minerals 982 Metallurgy 983
23.2 PYROMETALLURGY 984
The Pyrometallurgy of Iron 985 Formation of Steel 986
23.3 HYDROMETALLURGY 987
Hydrometallurgy of Gold 987 Hydrometallurgy of Aluminum 988
23.4 ELECTROMETALLURGY 988
Electrometallurgy of Sodium 988 Electrometallurgy of Aluminum 989
Electrorefining of Copper 990
23.5 METALLIC BONDING 991
Physical Properties of Metals 992 Electron-Sea Model
for Metallic Bonding 992 Molecular-Orbital Model for Metals 994
23.6 ALLOYS 995
lnterrnetallic Compounds 997
Contents xix

xx Contents
24
25
23.7 TRANSITION METALS 998
Physical Properties 999 Electron Configurations and Oxidation States 1 000
Magnetism 1001
23.8 CHEMISTRY OF SELECTED TRANSITION METALS 1002
Chromium 1 002 Iron 1 003 Copper 1 004
SUMMARY ANDKEYTERMS 1006 KEYSKILLS 1007
A Ooser l.Dok Charles M. Hall 990
A Closer Look Shape-Memory Alloys 998
Chemistry of Coordination
Compounds 1012
24.1 METAL COMPLEXES 1014
The Development o f Coordination Chemistry: Werner's Theory 1014
The Metal-Ligand Bond 1 01 6 Charges, Coordination Numbers, and
Geometries 1 01 6
24.2 LIGANDS WITH MORE THAN ONE DONOR ATOM 1 019
Metals and Chelates in Living Systems 1 021
24.3 NOMENCLATURE OF COORDINATION CHEMISTRY 1025
24.4 ISOMERISM 1026
Structural Isomerism 1 027 Stereoisomerism 1 027
24.5 COLOR AND MAGNETISM 1 031
Color 1 031 Magnetism 1 033
24.6 CRYSTAL-FIELD THEORY 1 033
Electron Configurations in Octahedral Complexes 1 037 Tetrahedral and
Square-Planar Complexes 1 038
SUMMARY ANDKEYTERMS 1042 KEYSKILLS 1043
A Closer l.Dolr Entropy and the Chelate Effect 1021
Chemistry andLife The Battle for Iron in Living Systems 1024
A Closer Loolt Charge-Transfer Color 1040
The Chemist�y of Life:
Organic and Biological Chemistry
25.1 SOME GENERAL CHARACTERISTICS
OF ORGANIC MOLECULES 1052
1050
The Structures of Organic Molecules 1052 The Stabilities of Organic
Substances 1 053 Solubility and Acid-Base Properties of Organic
Substances 1 054
25.2 INTRODUCTION TO HYDROCARBONS 1054
25.3 ALKANES, ALKENES, AND ALKYNES 1 055
Structures of Alkanes 1 056 Structural Isomers 1 057 Nomenclature of
Alkanes 1 058 Cycloalkanes 1 060 Reactions of Alkanes 1 061 Alkenes
1062 Alkynes 1 064 Addition Reactions of Alkenes and Alkynes 1 065
Mechanism of Addition Reactions 1 066 Aromatic Hydrocarbons 1 068
25.4 ORGANIC FUNCTIONAL GROUPS 1070
Alcohols 1 072 Ethers 1 073 Aldehydes and Ketones 1 073 Carboxylic
Acids and Esters 1 074 Amines and Amides 1 077

25.5 CHIRALITY IN ORGANIC CHEMISTRY 1078
25.6 INTRODUCTION TO BIOCHEMISTRY 1080
25.7 PROTEINS 1080
Amino Acids 1 080 Polypeptides and Proteins 1082
Protein Structure 1 084
25.8 CARBOHYDRATES 1086
Disaccharides 1 087 Polysaccharides 1 088
25.9 LIPIDS 1 089
25.10 NUCLEIC ACIDS 1090
SUMMARYANDKEYTERMS 1095 KEYSKILLS 1096
Oumtistry Put to �rk Gasoline 1061
Chemistry andLife Polycyclic Aromatic Hydrocarbons 1070
Chemistry Put to �rk Portrait of an Organic Chemical 1076
Chemistry andLife The Origins of Chirality in Living Systems 1085
Strategies in Chemistry What Now? 1094
Appendices
A Mathematical Operations II04
B Properties of Water IIII
C Thermodynamic Quantities for Selected Substances
at298.15K (25°C) 1112
D Aqueous Equilibrium Constants 1115
E Standard Reduction Potentials at 25 oc 1117
Answers to Selected Exercises A-1
Answers to "Give It Some Thought" A-36
Glossary G-1
Photo/Art Credits P-1
Index 1-1
Contents xxi

Chemical A lications and Essa s
Strate ies in Chemis
Estimating Answers 26
The Importance of Practice 28
Pattern Recognition 58
Problem Solving 89
How to Take a Test 106
Analyzing Chemical Reactions 143
Using Enthalpy as a Guide 180
Calculations Involving ManyVariables 404
What Now? 1094
Chemistr and Li e
Elements Required by Living Organisms 57
Glucose Monitoring 102
DrinkingToo Much Water Can KillYou 147
The Regulation of Human Body Temperature 185
Nuclear Spin and Magnetic Resonance Imaging 236
Ionic Size Makes a Big Difference 265
The Improbable Development ofLithium Drugs 280
The Chemistry ofVision 367
Blood Pressure 398
Fat- and Water-SolubleVitamins 538
Blood Gases and Deep-Sea Diving 540
Sickle-Cell Anemia 559
Nitrogen Fixation and Nitrogenase 610
The Amphiprotic Behavior ofAminoAcids 703
Blood as a Buffered Solution 729
Sinkholes 744
Tooth Decay and Fluoridation 747
Entropyand Life 815
Driving Nonspontaneous Reactions 830
Heartbeats and Electrocardiography 868
Medical Applications of Radiotracers 910
Radiation Therapy 922
How Much Perchlorate Is Too Much? 944
Nitroglycerin and Heart Disease 956
Arsenic in DrinkingWater 960
xxii
The Battle for Iron in Living Systems 1024
Polycyclic Aromatic Hydrocarbons 1070
The Origins of Chirality in Living Systems 1085
Chemistry and the Chemical Industry 4
Chemistryin the News 18
Antacids 135
The Hybrid Car 196
Explosives and Alfred Nobel 328
Orbitals and Energy 380
Gas Pipelines 409
Gas Separations 420
Supercritical Fluid Extraction 453
Cell Phone Tower Range 498
Recycling Plastics 501
Toward the Plastic Car 506
Liquid Crystal Displays 513
Methyl Bromide in the Atmosphere 590
Catalytic Converters 608
The Haber Process 631
Controlling Nitric Oxide Emissions 656
Amines andAmine Hydrochlorides 694
DirectMethanol Fuel Cells 874
Environmental Applications of Radioisotopes 921
Carbon Fibers and Composites 962
Gasoline 1061
Portrait of an Organic Chemical 1076
The Scientific Method 13
Basic Forces 45
The Mass Spectrometer 48
Glenn Seaborg and Seaborgium 51
The Aura of Gold 143
Energy, Enthalpy, and P- V Work 176

The Speed of Light 214
Measurement and the Uncertainty Principle 225
Probability Density and Radial ProbabilityFunctions 230
Experimental Evidence for Electron Spin 234
Effective Nuclear Charge 260
Calculation of Lattice Energies: The Born-Haber Cycle 304
Oxidation Numbers, Formal Charges, and Actual Partial
Charges 318
Phases in Atomic and Molecular Orbitals 373
The Ideal-Gas Equation 416
The Clausius-Oapeyron Equation 456
X-Ray Diffraction by Crystals 465
TheThird Form of Carbon 468
The Transistor 490
Hydrates 533
Ideal Solutions with Two or MoreVolatile Components 548
Chemical Applications and Essays xxiii
Colligative Properties of Electrolyte Solutions 554
Using Spectroscopic Methods to Measure Reaction
Rates 580
Limitations of Solubility Products 741
Other Greenhouse Gases 782
Water Softening 788
The Entropy Change when a Gas Expands
Isothermally 808
Entropy and Probability 812
What's "Free" About Free Energy? 822
The Dawning of the Nuclear Age 915
The Hydrogen Economy 937
Charles M. Hall 990
Shape-MemoryAlloys 998
Entropyand the Chelate Effect 1021
Charge-Transfer Color 1040

Preface
xxiv
TO THE INSTRUCTOR
Philosophy
This is the eleventh edition of a text that has enjoyed unprecedented success
over its many editions. It is fair to ask why there needs to be yet another edi
tion. The answer in part lies in thenature of chemistry itseU, a dynamic science
in a process of continual discovery. New research leads to new applications of
chemistry in other fields of science and in technology. In addition, environmen
tal and economic concerns bring about changes in the place of chemistry in so
ciety. We want our textbook to reflect that dynamic, changing character. We also
want it to convey the excitement that scientists experience in making new dis
coveries and contributing to our understanding of the physical world.
In addition, new ideas about how to present chemistry are being offered by
teachers of chemistry, and many of these new ideas are reflected in how the
textbook is organized and the ways in which individual topics are presented.
New technologies and new devices to assist students in learning lead to new
ways of presenting learning materials: the Internet, computer-based classroom
projection tools, and more effective means of testing, to name just a few. All of
these factors impact on how the text and the accompanying supplementary ma
terials are modified from one edition to the next.
Our aim in revising the text has been to ensure that it remains a central, in
dispensable learning tool for the student. It is the one device that can be carried
everywhere and used at any time, and as such, it is a one-stop source of all the
information that the student is likely to need for learning, skill development,
reference, and test preparation.
We believe that students are more enthusiastic about learning chemistry
when they see its importance to their own goals and interests. With this in
mind, we have highlighted many important applications of chemistry in every
day life. At the same time, the text provides the background in modern chem
istry that students need to serve their professional interests and, as appropriate,
to prepare for more advanced chemistry courses.
If the text is to support your role as teacher effectively, it must be addressed
to the students. We have done our best to keep our writing clear and interesting
and the book attractive and well-illustrated. Furthermore, we have provided nu
merous in-text study aids for students, including carefully placed descriptions
of problem-solving strategies. Together, we have logged many years of teaching
experience. We hope this is evident in our pacing and choice of examples.
A textbook is only as useful to students as the instructor permits it to be.
This book is loaded with many features that can help students learn and that
can guide them as they acquire both conceptual understanding and problem
solving skills. But the text and all the supplementary materials provided to sup
port its use must work in concert with the instructor. There is a great deal for the
students to use here, too much for all of it to be absorbed by any one student.
You, the instructor, are the guide to a proper use of the book. Only with your ac
tive help will the students be able to fully utilize all that the text and its supple
ments offer. Students care about grades, of course, but with encouragement,
they can also care about learning just because the subject matter is interesting.
Please consider emphasizing features of the book that can materially enhance
student appreciation of chemistry, such as the Chemistry Put to Work and
Chemistry and Life boxes that show how chemistry impacts modem life and its
relationship to health and life processes. Learn to use, and urge students to use,

the rich Internet resources available. Emphasize conceptual understanding,
and place less emphasis on simple manipulative, algorithmic problem solving.
Spending less time on solving a variety of gas law problems, for example, can
open up opportunities to talk about chemistry and the environment.
Organization and Contents
The first five chapters give a largely macroscopic, phenomenological view of
chemistry. The basic concepts introduced-such as nomenclature, stoichiome
try, and thermochemistry-provide necessary background for many of the lab
oratory experiments usually performed in general chemistry. We believe that
an early introduction to thermochemistry is desirable because so much of our
understanding of chemical processes is based on considerations of energy
change. Thermochemistry is also important when we come to a discussion of
bond enthalpies. We believe we have produced an effective, balanced approach
to teaching thermodynamics in general chemistry. It is no easy matter to walk
the narrow pathway between-on the one hand-trying to teach too much at
too high a level and-on the other-resorting to oversimplifications. As with
the book as a whole, the emphasis has been on imparting conceptual under
standing, as opposed to presenting equations into which students are supposed
to plug numbers.
The next four chapters (Chapters 6-9) deal with electronic structure and
bonding. We have largely retained our presentation of atomic orbitals. For more
advanced students, Closer Look boxes deal with radial probability functions and
the nature of antibonding orbitals. In Chapter 7 we have improved our discus
sion of atomic and ionic radii. The focus of the text then changes to the next
level of the organization of matter: the states of matter (Chapters 10 and 11) and
solutions (Chapter 13). Also included in this section is an applications chapter
on the chemistry of modern materials (Chapter 12), which builds on the stu
dent's understanding of chemical bonding and intermolecular interactions.
This chapter has again received substantial revision, in keeping with the rapid
pace of change in technology. It has been reorganized to emphasize a classifica
tion of materials based on their electronic bonding characteristics. This chapter
provides an opportunity to show how the sometimes abstract concept of chem
ical bonding impacts real world applications. The modular organization of the
chapter allows you to tailor your coverage to focus on those materials (semi
conductors, polymers, biomaterials, nanotechnology, etc.) that are most rele
vant to your students.
The next several chapters examine the factors that determine the speed and
extent of chemical reactions: kinetics (Chapter 14), equilibria (Chapters 15-17),
thermodynamics (Chapter 19), and electrochemistry (Chapter 20). Also in this
section is a chapter on environmental chemistry (Chapter 18), in which the con
cepts developed in preceding chapters are applied to a discussion of the atmos
phere and hydrosphere.
After a discussion of nuclear chemistry (Chapter 21), the final chapters sur
vey the chemistry of nonmetals, metals, organic chemistry, and biochemistry
(Chapters 22-25). Chapter 22 has been shortened slightly. Chapter 23 now con
tains a modern treatment of band structure and bonding in metals. A brief dis
cussion of lipids has been added to Chapter 25. These final chapters are
developed in a parallel fashion and can be treated in any order.
Our chapter sequence provides a fairly standard organization, but we recog
nize that not everyone teaches all the topics in exactly the order we have chosen.
We have therefore made sure that instructors can make common changes in
teaching sequence with no loss in student comprehension. In particular, many
instructors prefer to introduce gases (Chapter 10) after stoichiometry or after
thermochemistry rather than with states of matter. The chapter on gases has
been written to permit this change with no disruption in the flow of material. It
is also possible to treat the balancing of redox equations (Sections 20.1 and 20.2)
Preface xxv

xxvi Preface
earlier, after the introduction of redox reactions in Section 4.4. Finally, some
instructors like to cover organic chemistry (Chapter 25) right after bonding
(Chapter 9). This, too, is a largely seamless move.
We have introduced students to descriptive organic and inorganic chem
istry by integrating examples throughout the text. You will find pertinent and
relevant examples of "real" chemistry woven into all the chapters as a means to
illustrate principles and applications. Some chapters, of course, more directly
address the properties of elements and their compounds, especially Chapters 4,
7, 12, 18, and 22-25. We also incorporate descriptive organic and inorganic
chemistry in the end-of-chapter exercises.
Changes in This Edition
Some of the changes in the eleventh edition made in individual chapters have
already been mentioned. More broadly, we have introduced a number of new
features that are general throughout the text. Chemistry: The Central Science has
traditionally been valued for its clarity of writing, its scientific accuracy and
currency, its strong end-of-chapter exercises, and its consistency in level of cov
erage. In making changes, we have made sure not to compromise these charac
teristics. At the same time, we have responded to feedback received from the
faculty and students who used previous editions. To make the text easier for
students to use, we have continued to employ an open, clean design in the lay
out of the book. Illustrations that lend themselves to a more schematic, bolder
presentation of the underlyingprincipleshave been introduced or revised from
earlier versions. The art program in general has been strengthened, to better
convey the beauty, excitement, and concepts of chemistry to students. The
chapter-opening photos have been integrated into the introduction to each
chapter, and thus made more relevant to the chapter's contents.
We have continued to use the What's Ahead overview at the opening of
each chapter, introduced in the ninth edition, but we have changed the format
to make the materials more useful to students. Concept links (=) continue to
provide easy-to-see cross-references to pertinent material covered earlier in the
text. The essays titled Strategies in Chemistry, which provide advice to students
on problem solving and "thinking like a chemist," continue to be an important
feature. The Give It Some Thought exercises that we introduced in the tenth edi
tion have proven to be very popular, and we have increased their number.
These are informal, rather sharply focused questions that give students oppor
tunities to test whether they are actually "getting it" as they read along. We
have continued to emphasize conceptual exercises in the end-of-chapter exer
cise materials. The Visualizing Concepts category of exercise has been continued
in this edition. These exercises are designed to facilitate concept understanding
through use of models, graphs, and other visual materials. They precede the
regular end-of-chapter exercises and are identified in each case with the rele
vant chapter section number. We continue to use multi-focus graphics to depict
topics in macroscopic, microscopic, symbolic, and conceptual representation so
students learn to see chemistry the way scientists do, from a variety of perspec
tives. The Integrative Exercises, which give students the opportunity to solve
more challenging problems that integrate concepts from the present chapter
with those of previous chapters, have also been increased in number.
New essays in our well-received Chemistry Put to Work and Chemistry and
Life series emphasize world events, scientific discoveries, and medical break
throughs that have occurred since publication of the tenth edition. We maintain
our focus on the positive aspects of chemistry, withoutneglectingthe problems
that can arise in an increasingly technological world. Our goal is to help stu
dents appreciate the real-world perspective of chemistry and the ways in which
chemistry affects their lives.
A minor change that you will see throughout the text is the use of con
densed structural formulas for simple carboxylic acids. For example, we now
write CH3COOH for acetic acid instead of HC2H302.

You'll also find that we've
• Revised or replaced some of the end-of-chapter Exercises, with particular
focus on the black-numbered exercises (those not answered in the
Appendix).
• Integrated more conceptual questions into the end-of-chapter material.
For the convenience of instructors, these are identified by the CQ anno
tation in the Annotated Instructor's Edition, but not in the student edition
of the text.
• Carried the stepwise Analyze, Plan, Solve, Check problem-solving strategy
into nearly all of the Sample Exercises of the book to provide additional
guidance in problem solving.
• Expanded the use of dual-column problem-solving strategies in many
Sample Exercises to more clearly outline the process underlying mathemat
ical calculations, thereby helping students to better perform mathematical
calculations.
• Added both Key Skills and Key Equations sections to the end of chapter
material to help students focus their study.
TO THE STUDENT
Chemistry: The Central Science, Eleventh Edition, has been written to introduce
you to modem chemistry. As authors, we have, in effect, been engaged by
your instructor to help you learn chemistry. Based on the comments of stu
dents and instructors who have used this book in its previous editions, we be
lieve thatwe have done thatjob well. Ofcourse, we expect the text to continue
to evolve through future editions. We invite you to write to us to tell us what
you like about the book so that we will know where we have helped you most.
Also, we would like to learn of any shortcomings, so that we might further
improve the book in subsequent editions. Our addresses are given at the end
of the Preface.
Advice for Learning and Studying Chemistry
Learning chemistry requires both the assimilation of many new concepts and
the development of analytical skills. Inthis text we have provided you withnu
merous tools to help you succeed in both. If you are going to succeed in your
course in chemistry, you will have to develop good study habits. Science cours
es, and chemistry in particular, make different demands on your learning skills
than other types of courses. We offer the following tips for success in your
study of chemistry:
Don't fall behind! As your chemistry course moves along, new topics will
build on material already presented. If you don't keep up in your reading and
problem solving, you will find it much harder to follow the lectures and discus
sions on current topics. "Cramming" just before an exam has been shown to be
an ineffective way to study any subject, chemistry included.
Focus your study. The amount of information you will be expected to learn
can sometimes seem overwhelming. It is essential to recognize those concepts
and skills that are particularly important. Pay attention to what your instructor
is emphasizing. As you work through the Sample Exercises and homework as
signments, try to see what general principles and skills they deal with. Use the
What's Ahead feature at the beginning of each chapter to help orient you to
what is important in each chapter. A single reading of a chapter will simply not
be enough for successful learning of chapter concepts and problem-solving
skills. You will need to go over assigned materials more than once. Don't skip
the Give It Some Thought features, Sample Exercises, and Practice Exercises.
Preface xxvii

xxviii Preface
ACKNOWLEDGMENTS
They are your guides t o whether you are actually learning the material. The
Key Skills and Key Equations at the end of each chapter should help you focus
your study.
Keep good lecture notes. Your lecture notes will provide you with a clear and
concise record of what your instructor regards as the most important material
to learn. Use your lecture notes in conjunction with this text; that's your best
way to determine which material to study.
Skim topics in the text before they are covered in lecture. Reviewing a topic be
fore lecture will make it easier for you to take good notes. First read the intro
duction and Summary, then quickly read through the chapter, skipping Sample
Exercises and supplemental sections. Pay attention to the titles of sections and
subsections, which give you a feeling for the scope of topics. Try to avoid think
ing that you must learn and understand everything right away.
After lecture, carefully read the topics covered in class. As you read, pay atten
tion to the concepts presented and to the application of these concepts in the
Sample Exercises. Once you think you understand a Sample Exercise, test your
understanding by working the accompanying Practice Exercise.
Learn the language ofchemistry. As you study chemistry, you will encounter
many new words. It is important to pay attention to these words and to know
their meanings or the entities to which they refer. Knowing how to identify
chemical substances from their names is an important skill; it can help you
avoid painful mistakes on examinations. For example, "chlorine" and "chlo
ride" refer to very different things.
Attempt the assigned end-of-chapter exercises. Working the exercises that have
been selected by your instructor provides necessary practice in recalling and
using the essential ideas of the chapter. You cannot learn merely by observing;
you must be a participant. In particular, try to resist checking the Student
Solutions Manual (if you have one) until you have made a sincere effort to solve
the exercise yourself. If you really get stuck on an exercise, however, get help
from your instructor, your teaching assistant, or another student. Spending
more than 20 minutes on a single exercise is rarely effective unless you know
that it is particularly challenging.
Make use of the online resources. Some things are more easily learned by dis
covery, and others are best shown in three dimensions. If your instructor has
included Mastering Chemistry with your book, take advantage of the unique
tools it provides to get the most out of your time in chemistry.
The bottom line is to work hard, study effectively, and use the tools that are
available to you, including this textbook. We want to help you learn more about
the world of chemistry and why chemistry is the central science. If you learn
chemistry well, you can be the life of the party, impress your friends and
parents, and . . . well, also pass the course with a good grade.
The production of a textbook is a team effort requiring the involvement of many people besides the authors. Many peo
ple contributed hard work and talent to bring this edition to life. Although their names don't appear on the cover of the
book, their creativity, time, and support has been instrumental in all stages of its development and production.
Each of us has benefited greatly from discussions with colleagues and from correspondence with both instructors
and students both here and abroad. Colleagues have also helped immensely by reviewing our materials, sharing their
insights, and providing suggestions for improvements. On this edition we were particularly blessed with an exception
al group of accuracy checkers who read through our materials looking for both technical inaccuracies and typographi
cal errors.

Eleventh Edition Reviewers
Patricia Amateis
Todd L. Austell
Melita Balch
David L. Cedeflo
Elzbieta Cook
Enriqueta Cortez
Stephen Drucker
James M. farrar
Gregory M. Ferrence
Paul A. Flowers
Cheryl B. Frech
Kenneth A. French
EricGoll
Carl A. Hoeger
Michael 0. Hurst
Milton D. johnston, Jr.
Robley ). Light
Virginia Polytechnic Institute and State
University
University of North Carolina, Chapel Hill
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Preface xxxi
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Finally, we wish to thank our families and friends for their love, support, encouragement, and patience as we
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Theodore L. Brown
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Urbana-Champaign
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tlbrown@uiuc.edu
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Department ofChemistry
University ofNevada
Reno, NV 89557
lemay@unr.edu
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bbursten@utk.edu
Catherine ). Murphy
Department ofCizemistry
and Biochemistry
University of South Carolina
Columbia, SC 29208
murphy@mail.cltem.sc.edu
Patrick M. Woodward
Department ofChem istry
T7te Ohio State University
Columbus, OH 43210
woodward@chemistry.
ohio-state.edu

List of Resources
For Students
MasteringChem istry: MasteringChemistry is the first
adaptive-learning online homework system. It provides
selected end-of-chapter problems from the text, as well as
hundreds of tutorials with automatic grading, immediate
answer-specific feedback, and simpler questions on
request. Based on extensive research of precise concepts
students struggle with, MasteringChernistry uniquely
responds to your immediate learning needs, thereby
optimizing your study time.
Solutions to Red Exercises (0-13-600287-0) Prepared by
Roxy Wilson of the University of Illinois-Urbana
Champaign. Full solutions to all of the red-numbered
exercises in the text are provided. (Short answers to red
exercises are found in the appendix of the text).
Solutions to Black Exercises (0-13-600324-9) Prepared
by RoxyWilson of the University of illinois-Urbana
Champaign. Full solutions to all of the black-numbered
exercises in the text are provided.
Student's Guide (0-13-600264-1) Prepared byJames C.
Hill of California State University. This book assists
students through the text material with chapter overviews,
learning objectives, a review of key terms, as well as self
tests with answers and explanations. This edition also
features the addition of MCAT practice questions.
Laboratory Experiments (0-13-600285-4) Prepared by
John H. Nelson and Kenneth C. Kemp, both of the
University of Nevada. This manual contains 43 finely tuned
experiments chosen to introduce students to basic lab
techniques and to illustrate core chemical principles. This
new edition has been revised to correlate more tightlywith
the text and now features a guide on how to keep a lab
report notebook. You can also customize these labs through
Catalyst, our custom database program. For more
information, visit www.prenhall.com/catalyst.
Virtual Chemlab: An easy to use simulation of five
different general chemistry laboratories that can be used to
supplement a wet lab, for pre-laboratory and post
laboratory activities, for homework or quiz assignments, or
forclassroom demonstrations.
xxxii
For Instructors
Annotated Instructor's Edition (0-13-601250-7)
Prepared by Linda Brunauer of Santa Clara University.
Provides marginal notes and information for instructors
andTAs, including transparency icons, suggested lecture
demonstrations, teaching tips, and background references
from the chemical education literature.
Full Solutions Manual (0-13-600325-7) Prepared by
RoxyWilson of the University of Illinois-Urbana
Champaign.This manual contains all end-of-chapter
exercises in the text.With an instructor's permission,
this manual may be made available to students.
Instructor's Resource Center on CD-DVD (0-13-
600281-1)This resource provides an integrated collection of
resources to help you make efficient and effective use of your
time. This CD/DVD features most art from the text, including
figures and tables in PDF format for high-resolution prin
ting, as well as four pre-built PowerPointTM presentations.
Thefirst presentation contains the images embedded within
PowerPoint slides. The second includes a complete lecture
outline that is modifiable by the user. The final two
presentations contain worked "in chapter"sample exercises
and questions to be used with Classroom Response
Systems. This CD/DVD also contains movies, animations,
and electronic files of the Instructor's Resource Manual.
Test Item File (0-13-601251-5) Prepared by Joseph P.
Laurino and Donald Cannon, both of the University of
Tampa. The Test Item File now provides a selection of more
than 4000 test questions.
Instructor's Resource Manual (0-13-600237-4)
Prepared by Linda Brunauer of Santa Clara University and
Elizabeth Cook of the Universityof Louisiana. Organized
by chapter, this manual offers detailed lecture outlines and
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tions, the interactive media assets, common student
misconceptions, and more.
Transparencies (0-13-601256-6) Approximately 300 full
color transparencies put principles into visual perspective
and save you time when preparing lectures.
Annotated Instructor's Edition to Laboratory
Experiments (0-13-6002862) Prepared byJohn H. Nelson
and Kenneth C. Kemp, both of the University of Nevada.
This AlE combines the full student lab manual with
appendices covering the proper disposal of chemical waste,
safetyinstructions for the lab, descriptions of standard lab
equipment, answers to questions, and more.
BlackBoard and WebCT: Practice and assessment
materials are available upon request in these course
management platforms.

About the Authors
THEODORE L. BROWN received his Ph.D. from Michigan State University in 1956. Since then, he has been a
member of the faculty of the University of Jllinois, Urbana-Champaign, where he is now Professor of Chemistry,
Emeritus. He served as Vice Chancellor for Research, and Dean, The Graduate College, from 1980 to 1986, and as
Founding Director of the Arnold and Mabel Beckman Institute for Advanced Science and Technology from 1987 to
1993. Professor Brown has been an Alfred P. Sloan Foundation Research Fellow and has been awarded a Guggen
heim Fellowship. In 1972 he was awarded the American Chemical SocietyAward for Research in Inorganic Chem
istry, and received the American Chemical Society Award for Distinguished Service in the Advancement of
Inorganic Chemistry in 1993. He has been elected a Fellow ofboth the American Association for the Advancement
of Science and the American Academy of Arts and Sciences.
H. EUGENE LEMAY, JR., received his B.S. degree in Chemistry from Pacific Lutheran University (Washington)
and his Ph.D. in Chemistry in 1966 from the University of Illinois (Urbana). He then joined the faculty of the Univer
sity of Nevada, Reno, where he is currently Professor of Chemistry, Emeritus. He has enjoyed Visiting Professor
ships at the University of North Carolina at Chapel Hill, at the University College of Wales in Great Britain, and at
theUniversity of California, Los Angeles. Professor LeMay is a popular and effective teacher, who has taught thou
sands of students during more than 35 years of university teaching. Known for the clarity of his lectures and his
sense of humor, he has received severalteaching awards, including the University Distinguished Teacher ofthe Year
Award (1991) and the firstRegents' Teaching Award givenby the State of Nevada Board of Regents (1997).
BRUCE E. BURSTEN received his Ph.D. in Chemistry from the University of Wisconsin in 1978. After two years
as a National Science Foundation Postdoctoral Fellow at Texas A&M University, he joined the faculty of The Ohio
State University, where he rose to the rank of Distinguished University Professor. In 2005, he moved to his present
position at the University of Tennessee, Knoxville as Distinguished Professor of Chemistry and Dean of the College
of Arts and Sciences. Professor Bursten has been a Camille and Henry Dreyfus Foundation Teacher-Scholar and an
Alfred P. Sloan Foundation ResearchFellow, and he has been elected a Fellow of the American Association for the
Advancement of Science. At Ohio State he has received the University Distinguished Teaching Award in 1982 and
1996, the Arts and Sciences Student Council Outstanding Teaching Award in 1984, and the University Distinguished
ScholarAward in 1990. He receivedthe Spiers Memorial Prize and Medal of the Royal Society of Chemistry in 2003,
and the Morley Medal of the Cleveland Section of theAmerican Chemical Society in 2005. He was elected President
of the American Chemical Society for 2008. In addition to his teaching and service activities, Professor Bursten's re
search program focuses on compounds of the transition-metal and actinide elements.
CATHERINE J. MURPHY received two B.S. degrees, one in Chemistry and one in Biochemistry, from the Uni
versity of Illinois, Urbana-Champaign, in 1986. She received her Ph.D. in Chemistry from the University of Wiscon
sin in 1990. She was a National Science Foundation and National Institutes of Health Postdoctoral Fellow at the
California Institute of Technology from 1990 to 1993. In 1993, she joined the faculty of the University of South Car
olina, Columbia, where she is currently the Guy F. Lipscomb Professor of Chemistry. Professor Murphy has been
honored for both research and teaching as a Camille Dreyfus Teacher-Scholar, an Alfred P. Sloan Foundation Re
search Fellow, a Cottrell Scholar of the Research Corporation, a National Science Foundation CAREER Award win
ner, and a subsequent NSF Award for Special Creativity. She has also received a USC Mortar Board Excellence in
Teaching Award, the USC Golden Key Faculty Award for Creative Integration of Research and Undergraduate
Teaching, the USC Michael J. Mungo Undergraduate Teaching Award, and the USC Outstanding Undergraduate
Research Mentor Award. Since 2006, ProfessorMurphy has served as a Senior Editor to thejournalofPlzysicalChem
istry. Professor Murphy's researchprogram focuses on the synthesis and optical properties ofinorganic nanomate
rials, and on the local structure and dynamics of the DNA double helix.
Contributing Author
PATRICK M. WOODWARD received B.S. degrees inboth Chemistry and Engineering from Idaho State Uni
versity in 1991. He received a M.S. degreein MaterialsScienceand a Ph.D. in Chemistry from Oregon State Univer
sity in 1996. He spent two years as a postdoctoral researcher in the Department of Physics at Brookhaven National
Laboratory. In 1998, he joined the faculty of the Chemistry Department at The Ohio State University where he cur
rently holds the rank ofAssociate Professor. He has enjoyed visitingprofessorships at the Universityof Bordeaux, in
France, and the University of Sydney, in Australia. Professor Woodward has been anAlfredP. Sloan Foundation Re
search Fellow and a National Science Foundation CAREERAwardwinner. He currently serves as an Associate Edi
tor to thejournalofSolid State Chemistry and as the director of the Ohio REEL program, an NSF funded center that
works to bring authentic research experiments into the laboratories of first and second year chemistry classes in 15
colleges and universities across the state of Ohio. Professor Woodward's research program focuses on understand
ing the linksbetweenbonding, structure, and properties of solid state inorganic functional materials.
xxxili

INTRODUCTION: MATTER
AND MEASUREMENT
HUBBLE SPACE TELESCOPE IMAGE of the Crab Nebula, a 6-light-year-wide expanding remnant of a star's
supernova explosion. The orange filaments are the tattered remains of the star and consist mostly of hydrogen,
the simplest and most plentiful element in the un iverse. Hydrogen occurs as molecules in cool regions,
as atoms in hotter regions, and as ions in the hottest regions. The processes that occur within stars are
responsible for creating other chemical elements from hydrogen.

W H A T ' S A H E A D
1.1 The Study of Chemistry
We beginby providing a briefperspective of what
chemistry is about and why it is useful to learn
chemistry.
1.2 Classifications of Matter
Next, we examine some fundamental ways to
classify materials, distinguishing between pure
substances and mixtures and noting that there are
two fundamentally different kinds of pure
substances: elements and compounds.
1.3 Properties of Matter
We then consider some ofthe different kinds of
characteristics, orproperties,that we use to
characterize,identify, and separate substances.
1.4 Units of Measurement
We observe that manyproperties rely on
quantitative measurements, involving both
numbers and units. The units of measurement used
throughout science are those of the metricsystem,
a decimal system of measurement.
1.5 Uncertainty in Measurement
Wealso observe that the uncertainties inherent in
all measured quantities areexpressed by the
number of significantfigures used to report the
number. Significant figures are also used to express
the uncertainties associated with calculations
involving measured quantities.
1.6 Dimensional Analysis
We recognize thatunits as well as numbers are
carried through calculations and that obtaining
correct units for the resultof a calculation is an
important way to check whether the calculation
is correct.
HAVE YOU EVER WONDERED why ice melts and water
evaporates? Why do leaves turn colors in the fall,
and how does a battery generate electricity?
Why does keeping foods cold slow their spoilage, and
how do our bodies use food to maintain life?
Chemistry answers these questions and countless others like them. Chemistry
is the study of materials and the changes that materials undergo. One of the
joys of learning chemistry is seeing how chemical principles operate in all
aspects of our lives, from everyday activities like lighting a match to more
far-reaching matters like the development of drugs to cure cancer. Chemical
principles also operate in the far reaches of our galaxy (chapter-opening
photo) as well as within and around us.
This first chapter lays a foundation for our study of chemistry by provid
ing an overview of what chemistry is about and dealing with some fundamen
tal concepts of matter and scientific measurements. The list above, entitled
"What's Ahead," gives a brief overview of the organization of this chapter and
some of the ideas that we will consider. As you study, keep in mind that the
chemical facts and concepts you are asked to learn are not ends in themselves;
they are tools to help you better understand the world around you.

2 C HAPTER 1 Introduction: Matter and Measurement
,. Figure 1.1 Molecular models.
The white, dark gray, and red spheres
represent atomsof hydrogen, carbon,
and oxygen, respectively.
(a) Oxygen
1 . 1 THE STUDY OF CHEMISTRY
Before traveling to an unfamiliar city, you might look at a map to get some
sense of where you are heading. Because chemistry may be unfamiliar to you,
it's useful to get a general idea of what lies ahead before you embark on your
journey. In fact, you might even ask why you are taking the trip.
The Atomic and Molecular Perspective of Chemistry
Chemistry is the study of the properties and behavior of matter. Matter is the
physical material of the universe; it is anything that has mass and occupies
space. A property is any characteristic that allows us to recognize a particular
type of matter and to distinguish it from other types. This book, your body, the
clothes you are wearing, and the air you are breathing are all samples of matter.
Not all forms of matter are so common or so familiar. Countless experiments
have shown that the tremendous variety of matter in our world is due to com
binations of only about 100 very basic, or elementary, substances called
elements. As we proceed throughthis text, we will seek to relate the properties
of matter to its composition, that is, to the particular elements it contains.
Chemistry also provides a background to understanding the properties of
matter in terms of atoms, the almost infinitesimally small building blocks of
matter. Each element is composed of a unique kind of atom. We will see that the
properties of matter relate to both the kinds of atoms the matter contains
(composition) and to the arrangements of these atoms (structure).
Atoms can combine to form molecules in which two or more atoms are
joined together in specific shapes. Throughout this text you will see molecules
represented using colored spheres to show how their component atoms con
nect to each other (Figure 1.1 T). The color provides a convenient and easy way
to distinguish between the atoms of different elements. For examples, compare
the molecules of ethanol and ethylene glycol in Figure 1.1. Notice that these
molecules have different compositions and structures. Ethanol contains only
one oxygen atom, which is depicted by one red sphere. In contrast, ethylene
glycol has two atoms of oxygen.
Even apparently minor differences in the composition or structure of mole
cules can cause profound differences in their properties. Ethanol, also called
grain alcohol, is the alcohol in beverages such as beer and wine. Ethylene gly
col, on the other hand, is a viscous liquid used as automobile antifreeze. The
properties of these two substances differ in many ways, including the tempera
tures at which they freeze and boil. The biological activities of the two mole
cules are also quite different. Ethanol is consumed throughout the world, but
Ill
.,
•
,
you should never consume ethylene glycol be
•
cause it is highly toxic. One of the chal
lenges that chemists undertake is to
alter the composition or structure
of molecules in a controlled way,
creating new substances with
different properties.
(d) Ethanol • .,,
Every change in the
observable world
from boiling water to
the changes that occur
as our bodies combat
••
(b) Water
..
(c) Carbon dioxide (e) Ethylene glycol
•
•
•
(f) Aspirin
,
invading viruses-has its
basis in the world of atoms
and molecules. Thus, as we pro
ceed with our study of chemistry,
we will find ourselves thinking in
two realms: the macroscopic realm

of ordinary-sized objects (macro = large) and the submicroscopic realm of atoms
and molecules. We make our observations in the macroscopic world-in
the laboratory and in our everyday surroundings. To understand that world,
however, we must visualize how atoms and molecules behave at the sub
microscopic level. Chemistry is the science that seeks to understand the proper
ties and behavior of matter by studying the properties and behavior of atoms
and molecules.
G I V E I T S O M E T H O U G H T
(a) In round numbers, about how many elements are there? (b) What submicroscopic
particles are the building blocks of matter?
Why Study Chemistry?
Chemistry provides important understanding of our world and how it works.
It is an extremely practical science that greatly impacts our daily lives. Indeed,
chemistry lies near the heart of many matters of public concern: improvement
ofhealth care; conservation of natural resources; protection ofthe environment;
and provision of our everyday needs for food, clothing, and shelter. Using
chemistry, we have discovered pharmaceutical chemicals that enhance our
health and prolong our lives. We have increased food production through the
use of fertilizers and pesticides, and we have developed plastics and other ma
terials that are used in almost every facet of our lives. Unfortunately, some
chemicals also havethe potential to harm our health or the environment. As ed
ucated citizens and consumers, it is in our best interest to understand the pro
found effects, both positive and negative,thatchemicals have on our lives and
to strike an informed balance about their uses.
Most ofyou are studying chemistry, however,notmerely to satisfy your cu
riosity or to become more informed consumers or citizens, but because it is an
essential part of your curriculum. Your major might be biology, engineering,
pharmacy, agriculture, geology, or some other field. Why do so many diverse
subjects share an essential tie to chemistry? The answer is that chemistry, by its
very nature, is the central science, central to a fundamental understanding of
other sciences and technologies. For example, our interactions with the materi
al world raise basic questions about the materials around us. What are their
compositions and properties? How do they interact with us and our environ
ment? How, why, and when do they undergo change? These questions are im
portant whether the material is part of high-tech computer chips, a pigment
used by a Renaissance painter, or the DNA that transmits genetic information
in our bodies (Figure 1.2T).
By studying chemistry, you will learn to use the powerful language and
ideas that have evolved to describe and enhance our understanding of matter.
The language of chemistry is a universal scientific language that is widely used
(a) (b)
1.1 The Study of Chemistry 3
"f' Figure 1 .2 Chemistry helps us
better understand materials. (a) A
microscopic view of an EPROM (Erasable
Programmable Read-Only Memory)
silicon microchip. (b) A Renaissance
painting, Young Girl Reading, by Vittore
Carpaccio (1 472-1 S26). (c) A long
strand of DNA that has spilled out of the
damaged cell wall of a bacterium.
(c)

4 CHAPTER 1 Introduction: Matter and Measurement
Chemis Rut to Work CHEMISTRY AND THE CHEMICAL INDUSTRY
M
anypeople are familiar with common household chem
icals such as those shown in Figure 1.3II>, butfew realize
the size and importance of the chemical industry. Worldwide
sales of chemicals and related products manufactured in the
United States total approximately $550 billion annually. The
chemical industry employs more than 10% ofall scientists and
engineers and is a major contributor to the US economy.
Vastamountsofchemicalsareproducedeachyearand serve
as raw materials for a variety of uses, including the manufacture
of metals, plastics, fertilizers, pharmaceuticals, fuels, paints, ad
hesives, pesticides, synthetic fibers, microprocessor chips, and
numerous other products. Table 1.1 T lists the top eightchemicals
produced in the United States. We will discuss many of these
substances and theiruses as the course progresses.
People who have degrees in chemistry hold a variety ofpo
sitionsin industry, government, and academia.Thosewho work
in the chemical industry find positions as laboratory chemists,
carrying out experiments to develop new products (research
and development), analyzing materials (quality control), or as
sisting customers in using products (sales and service). Those
with more experience or training may work as managers or
company directors. Achemistry degree also can prepare you for
alternate careers in teaching, medicine, biomedical research, in
formation science, environmental work, technical sales, work
with government regulatory agencies, and patent law.
""' Figure 1 .3 Household chemkals. Many common
supermarket products have very simple chemical compositions.
TABLE 1 .1 • The Top Eight Chemicals Produced by the Chemical Industry in 2006'
2006 Production
Rank Chemical Formula (billions of pounds) Principal End Uses
1 Sulfuric acid H2S04 79 Fertilizers, chemical manufacturing
2 Ethylene C2H4 55 Plastics, antifreeze
3 Lime CaO 45 Paper, cement, steel
4 Propylene C3H6 35 Plastics
5 Phosphoric acid H3P04 24 Fertilizers
6 Ammonia NH3 23 Fertilizers
7 Chlorine Cl2 23 Bleaches, plastics, water purification
8 Sodium hydroxide NaOH 18 Aluminum production, soap
aMost data from Chemicaland EngineeringNews, July 2,2007,pp. 57, 60.
in other disciplines. Furthermore, an understanding of the behavior of atoms
and molecules provides powerful insights into other areas of modern science,
technology, and engineering.
1 .2 CLASSIFICATIONS OF MATTER
Let's begin our study of chemistry by examining some fundamental ways in
which matter is classified and described. Two principal ways of classifying
matter are according to its physical state (as a gas, liquid, or solid) and accord
ing to its composition (as an element, compound, or mixture).
States of Matter
A sample ofmattercan be a gas, a liquid, or a solid. These three forms ofmatter
are calledthe states of matter. Thestates ofmatter differ in some oftheir simple

observableproperties. A gas (also known as vapor)
has no fixed volume or shape; rather, it conforms
to the volume and shape of its container. A gas can
be compressed to occupy a smaller volume, or it
can expand to occupy a larger one. A liquid has a
distinct volume independent of its container but
has no specific shape. A liquid assumes the shape
of the portion of the container that it occupies. A
solid has both a definite shape and a definite vol
ume. Neither liquids nor solids can be com
pressed to any appreciable extent.
The properties of the states of matter can be
understood on the molecular level (Figure
1.4 .,.). In a gas the molecules are far apart and
are moving at high speeds, colliding re
peatedly with each other and with the
walls of the container. Compressing
a gas decreases the amount of space
between molecules, increases the
frequency of collisions between
molecules, but does not alter the
size or shape of the molecules. In a
liquid the molecules are packed close
ly together but still move rapidly. The
1.2 Classifications of Matter 5
rapid movement allows the molecules to Gas Liquid Solid
slide over each other; thus, a liquid pours eas-
ily. In a solid the molecules are held tightly together, usually in definite
arrangements in which the molecules can wiggle only slightly in their other
wise fixed positions.
Pure Substances
Most forms ofmatter that we encounter-for example, the air we breathe (a gas),
gasoline for cars (a liquid), and the sidewalk onwhich we walk (asolid)-arenot
chemicallypure. We can, however, resolve, or separate, theseforms ofmatterinto
different pure substances. A pure substance (usually referred to simply as a
substance) is matter that has distinct properties and a composition that does not
varyfromsample to sample. Water and ordinary table salt (sodium chloride),the
primary components of seawater, are examples of pure substances.
All substances are either elements or compounds. Elements cannot be de
composed into simpler substances. On the molecular level, each element is
composed of only one kind of atom [Figure l.S(a and b)T)]. Compounds are
(a) Atoms of an element (b) Molecules (c) Molecules
of an element of a compound
.6. Figure 1 .4 The three physical
states of water-water vapor, liquid
water, and Ice. In this photo we see
both the liquid and solid states of water.
We cannot see water vapor. What we see
when we look at steam or clouds is tiny
droplets of liquid water dispersed in the
atmosphere. The molecular views show
that the molecules in the gas are much
further apart than those in the liquid or
solid. The molecules in the liquid
do not have the orderly arrangement
seen in the solid.
(d) Mixture of elements
and a compound
.6. Figure 1 .5 Molecular comparison of element, compounds, and mixtures. Each element contains a unique kind
of atom. Elements might consist of individual atoms, as in (a), or molecules, as in (b). Compounds contain two or more
different atoms chemically joined together, as in (c). A mixture contains the individual units of its components, shown in
(d) as both atoms and molecules.

6 CHAPTER 1 Introduction: Matter and Measurement
.,. Figure 1 .6 Relative abundances of
elements. Elements in percent by mass
in (a) Earth's crust (including oceans and
atmosphere) and (b) the human body.
Aluminum
7.5%
Earth's crust
(a)
Other
7%
I
Hydrogen
/ 10%
Human body
(b)
substances composed of two or more elements; they contain two or more kinds
of atoms [Figure l.S(c)]. Water, for example, is a compound composed oftwo el
ements: hydrogen and oxygen. Figure l.S(d) shows a mixture of substances.
Mixtures are combinations of two or more substances in which each substance
retains its own chemical identity.
Elements
Currently, 117 elements are known. These elements vary widely in their abun
dance, as shown in Figure 1.6 .a.. For example, only five elements-oxygen,
silicon, aluminum, iron, and calcium-account for over 90% of Earth's crust
(including oceans and atmosphere). Similarly, just three elements-oxygen,
carbon, and hydrogen-account for over 90% of the mass of the human body.
Some ofthe morecommon elements are listed in Table 1.2..,, along with the
chemical abbreviations, or chemical symbols, used to denote them. The symbol
for each element consists of one or two letters, with the first letter capitalized.
These symbols are mostly derived from the English name for the element, but
sometimes they are derived from a foreignname instead (last column in Table
1.2). You will need to know these symbols and learn others as we encounter
them in the text.
All the known elements and their symbols are listed on the front inside
cover of this text. The table in which the symbol for each element is enclosed in
a box is called the periodic table. In the periodic table the elements are arranged
in vertical columns so that closely related elements are grouped together. We
describe the periodic table in more detail in Section 2.5.
G I V E I T S O M E T H O U G H T
Which element is most abundant inboth Earth's crust and in the human body? What
is the symbol for this element?
Compounds
Most elements can interact with other elements to form compounds. For exam
ple, consider the fact that when hydrogen gas burns in oxygen gas, the
TABLE 1 .2 • Some Common Elements and Their Symbols
Carbon c Aluminum AI Copper Cu (from cuprum)
Fluorine F Bromine Br Iron Fe (fromferrum)
Hydrogen H Calcium Ca Lead Pb (from plumbum)
Iodine I Chlorine Cl Mercury Hg (from hydrargyrum)
Nitrogen N Helium He Potassium K (from knlium)
Oxygen 0 Lithium Li Silver Ag (from argentum)
Phosphorus p Magnesium Mg Sodium Na (from natrium)
Sulfur s Silicon Si Tin Sn (from stannum)

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