This document outlines key concepts for a chemistry course, including:
- The goals of identifying elements, understanding measurement units, significant figures, and types of errors.
- Definitions of matter, properties, physical and chemical changes, and the three states of matter.
- The International System of Units (SI) including common units like meters, grams, kelvin, and moles.
- Concepts like energy, elements, and the periodic table, and examples of calculating density, conversions between units, and solving chemistry problems systematically.
Intro to physical science and measurementssihellyay
This document provides an introduction to physical science. It begins by defining science and listing the main branches - biological science, physical science, and social science. Biological science deals with living things, social science deals with human behavior and societies. Physical science deals with non-living things, their composition, nature, characteristics, and changes.
The main branches of physical science are then defined: chemistry studies matter and its properties/structure/changes, physics studies matter and energy/their interactions, astronomy studies the universe/heavenly bodies, geology studies Earth materials/structures/processes, and meteorology studies the atmosphere/weather/climate.
The document then moves to a chapter about measurement, defining it as collecting quantitative data by
This document discusses physics and related topics. It defines physics as the study of the laws and theories that explain the structure of the universe in terms of matter and energy. It then discusses areas of modern physics like atomic physics, nuclear physics, and particle physics. It also covers applications of physics such as astrophysics, biophysics, and geophysics. Finally, it discusses scientific methodology, measurement, and units of measurement.
The document provides an overview of an introduction to chemistry textbook. It summarizes the content of several sections, including: Section 1.1 discusses chemistry as the study of matter and substances, and how the ozone layer forms and is threatened by chlorofluorocarbons. Section 1.2 explains the difference between mass and weight, and how chemistry studies matter on submicroscopic and macroscopic levels. Section 1.3 outlines the scientific method and different types of data and variables used.
This document provides an outline for lessons on the topic of chemical equilibrium. It includes:
1) Four lessons that cover investigating equilibrium reactions, determining equilibrium constants (Kc), using the ICE method to solve equilibrium problems, and the relationship between Gibbs free energy (ΔG) and equilibrium.
2) Details of activities and assessments at various levels for each lesson, including determining Kc values, using ICE to find equilibrium concentrations, defining Gibbs free energy, and relating ΔG to Kc.
3) Examples of ICE questions to work through in class covering determining Kc from concentrations, finding concentrations from Kc, and cases where Kc is very small.
4) A discussion of
The document discusses states of matter and phase changes. It covers 5 sections: gases, forces of attraction, liquids and solids, and phase changes. The sections explain the kinetic molecular theory of gases, intermolecular forces, properties of liquids and solids, and how energy causes substances to change phases from solid to liquid to gas. Diagrams and formulas are provided.
This document describes matter and its characteristics including mass, volume, weight, and density. It defines matter as anything that has mass and volume. Volume is the amount of space an object takes up while mass is the amount of matter in an object. Weight is the force produced by gravity acting on an object. The document also discusses units of measurement in the International System of units (SI units) and how to convert between units using conversion factors. It defines physical properties as those that can change without changing a substance's identity, like color or density. Chemical properties describe a substance's ability to undergo chemical reactions.
The document discusses several sample exercises involving units and conversions. In one example, the density of a gas is calculated from its mass and volume. The mass is found by subtracting the masses of an empty and full container. The density is calculated to two significant figures based on the number of significant figures in the mass and volume measurements. In another example, the average speed of a nitrogen molecule is converted from meters per second to miles per hour using multiple conversion factors.
Intro to physical science and measurementssihellyay
This document provides an introduction to physical science. It begins by defining science and listing the main branches - biological science, physical science, and social science. Biological science deals with living things, social science deals with human behavior and societies. Physical science deals with non-living things, their composition, nature, characteristics, and changes.
The main branches of physical science are then defined: chemistry studies matter and its properties/structure/changes, physics studies matter and energy/their interactions, astronomy studies the universe/heavenly bodies, geology studies Earth materials/structures/processes, and meteorology studies the atmosphere/weather/climate.
The document then moves to a chapter about measurement, defining it as collecting quantitative data by
This document discusses physics and related topics. It defines physics as the study of the laws and theories that explain the structure of the universe in terms of matter and energy. It then discusses areas of modern physics like atomic physics, nuclear physics, and particle physics. It also covers applications of physics such as astrophysics, biophysics, and geophysics. Finally, it discusses scientific methodology, measurement, and units of measurement.
The document provides an overview of an introduction to chemistry textbook. It summarizes the content of several sections, including: Section 1.1 discusses chemistry as the study of matter and substances, and how the ozone layer forms and is threatened by chlorofluorocarbons. Section 1.2 explains the difference between mass and weight, and how chemistry studies matter on submicroscopic and macroscopic levels. Section 1.3 outlines the scientific method and different types of data and variables used.
This document provides an outline for lessons on the topic of chemical equilibrium. It includes:
1) Four lessons that cover investigating equilibrium reactions, determining equilibrium constants (Kc), using the ICE method to solve equilibrium problems, and the relationship between Gibbs free energy (ΔG) and equilibrium.
2) Details of activities and assessments at various levels for each lesson, including determining Kc values, using ICE to find equilibrium concentrations, defining Gibbs free energy, and relating ΔG to Kc.
3) Examples of ICE questions to work through in class covering determining Kc from concentrations, finding concentrations from Kc, and cases where Kc is very small.
4) A discussion of
The document discusses states of matter and phase changes. It covers 5 sections: gases, forces of attraction, liquids and solids, and phase changes. The sections explain the kinetic molecular theory of gases, intermolecular forces, properties of liquids and solids, and how energy causes substances to change phases from solid to liquid to gas. Diagrams and formulas are provided.
This document describes matter and its characteristics including mass, volume, weight, and density. It defines matter as anything that has mass and volume. Volume is the amount of space an object takes up while mass is the amount of matter in an object. Weight is the force produced by gravity acting on an object. The document also discusses units of measurement in the International System of units (SI units) and how to convert between units using conversion factors. It defines physical properties as those that can change without changing a substance's identity, like color or density. Chemical properties describe a substance's ability to undergo chemical reactions.
The document discusses several sample exercises involving units and conversions. In one example, the density of a gas is calculated from its mass and volume. The mass is found by subtracting the masses of an empty and full container. The density is calculated to two significant figures based on the number of significant figures in the mass and volume measurements. In another example, the average speed of a nitrogen molecule is converted from meters per second to miles per hour using multiple conversion factors.
States of matter can exist as solids, liquids, or gases. Gases have no definite shape or volume, are highly compressible, and their molecules are far apart with weak intermolecular forces. Liquids have a definite volume but no definite shape, while solids have both a definite shape and volume. The behavior of gases is explained by gas laws such as Boyle's law, Charles's law, Avogadro's law, Dalton's law of partial pressures, Graham's law of diffusion, and the ideal gas law. Gases can be liquefied under high pressure and low temperature due to intermolecular attractions that cause real gases to deviate from ideal behavior.
This document provides an overview of chapter 5 from the textbook, which covers gases and the kinetic molecular theory. It begins with learning objectives and concepts to understand from sections 5.5 through 5.12. There is then an explanation of applications of the gas laws, including Dalton's law of partial pressures and collecting gases over water. The document continues with explanations of gas density, the ideal gas law, Graham's law of effusion, and the kinetic molecular theory. It includes sample problems and exercises related to these topics.
This document summarizes key concepts from Chapter 2 of a chemistry textbook, including:
1) Physical quantities like mass, volume, and temperature can be described using a number and standard unit, such as kilograms for mass.
2) The International System of Units (SI units) provides standard units for many physical quantities to avoid confusion.
3) Other concepts covered include density, specific heat, scientific notation, and methods for measuring or converting between different units.
Chemistry is the study of matter, its properties, and the changes it undergoes. Matter is anything that has mass and takes up space, and is composed of atoms. Atoms are the building blocks of matter and each element is made of the same type of atom. Compounds are made of two or more different elements chemically bonded together. Mixtures contain two or more substances mixed but not chemically combined. Measurements in chemistry use significant figures and the SI system of units including meters, grams, and liters.
Chemistry is the study of matter, its properties, and the changes it undergoes. Matter is anything that has mass and takes up space, and is composed of atoms. Atoms are the building blocks of matter and each element is made of the same type of atom. Compounds are made of two or more different elements chemically bonded together. Mixtures contain two or more substances mixed but not chemically combined. Measurements in chemistry use significant figures and units to accurately quantify properties and changes in matter.
Thermochemistry deals with the heat involved in chemical and physical changes. It is a branch of thermodynamics that studies energy and its transformations. Enthalpy (H) is a measure of the total energy of a system at constant pressure and can be used to determine the heat of a reaction. Calorimetry experiments allow measurement of heat changes through determination of temperature changes of a system and surroundings using equations such as q = cmΔT. Bomb calorimetry and coffee cup calorimetry are two common techniques used to directly measure the heat of chemical reactions.
This is a basic overview of your first chemistry exam. You will find real test problems and explanations so you know what to be expecting. We will also go over this presentation together.
The document provides an overview of key concepts in science including the scientific method, branches of science, and measurement. It discusses how curiosity drives science and the goal of expanding knowledge. Technology applies scientific knowledge to solve practical problems. The scientific method involves making observations, asking questions, developing hypotheses, experimentation, analysis, and conclusions. Measurement units include the metric system (SI units) and significant figures. Assessment questions review topics like the difference between elements and compounds, physical and chemical properties, and states of matter.
This document provides an overview of three sections (13.1, 13.2, 13.3) from a chemistry textbook chapter on gases. Section 13.1 describes gas laws including Boyle's law, Charles' law, Gay-Lussac's law, and the combined gas law. Section 13.2 introduces the ideal gas law, Avogadro's principle, and compares real and ideal gases. Section 13.3 explains how to use gas laws and stoichiometry to solve problems involving gaseous reactants and products in chemical equations.
This document provides an overview of gas laws and the behavior of gases. It begins by defining the three states of matter and distinguishing properties of gases. Gas pressure and its measurement are then discussed, including common pressure units. The document outlines the major gas laws - Boyle's Law relating pressure and volume at constant temperature, Charles' Law relating volume and temperature at constant pressure, and the Combined Gas Law combining these relationships. Examples are provided to demonstrate applications of the gas laws. The ideal gas law is defined as relating pressure, volume, temperature, and moles of gas. The behavior of gases at standard temperature and pressure is also covered.
This document provides an overview of fundamental concepts in physics. It discusses physics as the study of fundamental principles of the universe. The objectives of physics are to find fundamental laws that govern natural phenomena and use them to develop mathematical theories that can predict experimental results. Theories are developed based on experiments and make predictions that are tested. Fundamental quantities like length, mass and time form the basis for defining other physical quantities. Standard systems of measurement like the SI system are discussed. The document also covers dimensional analysis, scientific notation, and significant figures which are important concepts in physics measurements.
These learning materials were designed to address the SOPEEC 2004 Canadian syllabus for 3rd Class Power Engineering Certification. It covers topics in applied mechanics, thermodynamics, chemistry, boiler codes, electrical theory, instrumentation, pumps, boilers, prime movers, and refrigeration. The document provides learning outcomes and objectives for each topic to help students learn problem solving skills and understand key concepts needed to obtain their power engineering certification.
This document provides a summary of sections from a chemistry textbook chapter on properties and changes in matter. It summarizes key concepts from sections on properties of matter, changes in matter, mixtures of matter, and elements and compounds. The sections define states of matter, physical and chemical properties, physical and chemical changes, mixtures, elements, compounds, and laws of chemistry such as definite and multiple proportions.
The scientific method is a set of procedures used to develop explanations of natural phenomena and possibly to predict additional phenomena. For example,
The average temperature of seawater increases, the seawater will become less dense, its volume will increase, and sea level will rise even if no continental ice melts.
Chemistry zimsec chapter 2 atoms, molecules and stoichiometryalproelearning
This document provides an overview of Chapter 2 in a chemistry textbook, which covers topics including:
- The mass of atoms and molecules, including relative atomic mass and molecular mass
- Using a mass spectrometer to determine relative isotopic masses and abundances
- The mole concept and amount of substance in relation to mass, volume of gases, and concentration of solutions
- Calculating empirical formulas from combustion data or elemental composition by mass and deducing molecular formulas
- Stoichiometry, including writing balanced chemical equations and ionic equations
Mathematics: The Basic Tool in Understanding PhysicsJunhel Dalanon
The document discusses various measurement units and systems including metric and English/imperial units. It provides examples of converting between units for length, mass, volume, temperature and other quantities. Dimensional analysis is introduced as a method for solving measurement conversion problems by analyzing the units involved. Word problems combining multiple conversion steps are presented as practice examples.
This document provides an overview of key concepts in introductory chemistry. It discusses three perspectives for understanding chemical systems: macroscopic, microscopic, and symbolic. It also covers the scientific method, properties of matter, phases of matter, chemical vs physical changes, the particulate nature of matter, and the use of measurements, units, and significant figures in chemistry. Example problems are provided to illustrate concepts like ratios, conceptual understanding of particles, and visualizing phenomena at different levels.
This document discusses gases and the Kinetic Molecular Theory (KMT). It defines important characteristics of gases such as being highly compressible and having low densities. It also lists measurable properties of gases like pressure, volume, and temperature and their units. The KMT makes assumptions about gas particles being in constant random motion, having negligible actual volume, and not attracting or repelling each other. The KMT also assumes elastic collisions and that average kinetic energy is directly proportional to Kelvin temperature. A gas that follows all KMT postulates is considered an ideal gas.
This document provides an overview of key concepts in chemistry including definitions of matter, physical and chemical properties, states of matter, and energy. It discusses the scientific approach of developing models through observation, hypothesis, experimentation, and further testing. Measurement concepts such as units, conversions, uncertainty, and significant figures are explained. Examples demonstrate solving problems involving unit conversions, density calculations, and determining the number of significant figures. Fundamental chemistry topics like the periodic table, bonding, and reactions are introduced.
This document provides an overview of key concepts from the first chapter of a chemistry textbook, including:
- Chemistry is the study of matter, its properties, and changes in matter.
- There are three states of matter - solids, liquids, and gases - which are distinguished by their physical properties. Changes in state are physical changes.
- Chemical and physical properties are introduced, along with the distinction between physical and chemical changes.
- Concepts of energy, including potential and kinetic energy, are covered. Energy changes that occur during physical and chemical processes are discussed.
- Measurement and problem solving in chemistry are addressed, including the use of units and conversion factors to calculate quantities.
This document provides an overview of key concepts in chemistry covered in Chapter 1 of the textbook "Chemistry: The Molecular Nature of Matter and Change". It defines chemistry as the study of matter, its properties, and changes in matter. Key topics covered include the states of matter, physical and chemical properties, physical and chemical changes, energy, measurement, and units. Sample problems demonstrate how to solve for quantities like density, mass, volume, and conversions between metric and other units.
States of matter can exist as solids, liquids, or gases. Gases have no definite shape or volume, are highly compressible, and their molecules are far apart with weak intermolecular forces. Liquids have a definite volume but no definite shape, while solids have both a definite shape and volume. The behavior of gases is explained by gas laws such as Boyle's law, Charles's law, Avogadro's law, Dalton's law of partial pressures, Graham's law of diffusion, and the ideal gas law. Gases can be liquefied under high pressure and low temperature due to intermolecular attractions that cause real gases to deviate from ideal behavior.
This document provides an overview of chapter 5 from the textbook, which covers gases and the kinetic molecular theory. It begins with learning objectives and concepts to understand from sections 5.5 through 5.12. There is then an explanation of applications of the gas laws, including Dalton's law of partial pressures and collecting gases over water. The document continues with explanations of gas density, the ideal gas law, Graham's law of effusion, and the kinetic molecular theory. It includes sample problems and exercises related to these topics.
This document summarizes key concepts from Chapter 2 of a chemistry textbook, including:
1) Physical quantities like mass, volume, and temperature can be described using a number and standard unit, such as kilograms for mass.
2) The International System of Units (SI units) provides standard units for many physical quantities to avoid confusion.
3) Other concepts covered include density, specific heat, scientific notation, and methods for measuring or converting between different units.
Chemistry is the study of matter, its properties, and the changes it undergoes. Matter is anything that has mass and takes up space, and is composed of atoms. Atoms are the building blocks of matter and each element is made of the same type of atom. Compounds are made of two or more different elements chemically bonded together. Mixtures contain two or more substances mixed but not chemically combined. Measurements in chemistry use significant figures and the SI system of units including meters, grams, and liters.
Chemistry is the study of matter, its properties, and the changes it undergoes. Matter is anything that has mass and takes up space, and is composed of atoms. Atoms are the building blocks of matter and each element is made of the same type of atom. Compounds are made of two or more different elements chemically bonded together. Mixtures contain two or more substances mixed but not chemically combined. Measurements in chemistry use significant figures and units to accurately quantify properties and changes in matter.
Thermochemistry deals with the heat involved in chemical and physical changes. It is a branch of thermodynamics that studies energy and its transformations. Enthalpy (H) is a measure of the total energy of a system at constant pressure and can be used to determine the heat of a reaction. Calorimetry experiments allow measurement of heat changes through determination of temperature changes of a system and surroundings using equations such as q = cmΔT. Bomb calorimetry and coffee cup calorimetry are two common techniques used to directly measure the heat of chemical reactions.
This is a basic overview of your first chemistry exam. You will find real test problems and explanations so you know what to be expecting. We will also go over this presentation together.
The document provides an overview of key concepts in science including the scientific method, branches of science, and measurement. It discusses how curiosity drives science and the goal of expanding knowledge. Technology applies scientific knowledge to solve practical problems. The scientific method involves making observations, asking questions, developing hypotheses, experimentation, analysis, and conclusions. Measurement units include the metric system (SI units) and significant figures. Assessment questions review topics like the difference between elements and compounds, physical and chemical properties, and states of matter.
This document provides an overview of three sections (13.1, 13.2, 13.3) from a chemistry textbook chapter on gases. Section 13.1 describes gas laws including Boyle's law, Charles' law, Gay-Lussac's law, and the combined gas law. Section 13.2 introduces the ideal gas law, Avogadro's principle, and compares real and ideal gases. Section 13.3 explains how to use gas laws and stoichiometry to solve problems involving gaseous reactants and products in chemical equations.
This document provides an overview of gas laws and the behavior of gases. It begins by defining the three states of matter and distinguishing properties of gases. Gas pressure and its measurement are then discussed, including common pressure units. The document outlines the major gas laws - Boyle's Law relating pressure and volume at constant temperature, Charles' Law relating volume and temperature at constant pressure, and the Combined Gas Law combining these relationships. Examples are provided to demonstrate applications of the gas laws. The ideal gas law is defined as relating pressure, volume, temperature, and moles of gas. The behavior of gases at standard temperature and pressure is also covered.
This document provides an overview of fundamental concepts in physics. It discusses physics as the study of fundamental principles of the universe. The objectives of physics are to find fundamental laws that govern natural phenomena and use them to develop mathematical theories that can predict experimental results. Theories are developed based on experiments and make predictions that are tested. Fundamental quantities like length, mass and time form the basis for defining other physical quantities. Standard systems of measurement like the SI system are discussed. The document also covers dimensional analysis, scientific notation, and significant figures which are important concepts in physics measurements.
These learning materials were designed to address the SOPEEC 2004 Canadian syllabus for 3rd Class Power Engineering Certification. It covers topics in applied mechanics, thermodynamics, chemistry, boiler codes, electrical theory, instrumentation, pumps, boilers, prime movers, and refrigeration. The document provides learning outcomes and objectives for each topic to help students learn problem solving skills and understand key concepts needed to obtain their power engineering certification.
This document provides a summary of sections from a chemistry textbook chapter on properties and changes in matter. It summarizes key concepts from sections on properties of matter, changes in matter, mixtures of matter, and elements and compounds. The sections define states of matter, physical and chemical properties, physical and chemical changes, mixtures, elements, compounds, and laws of chemistry such as definite and multiple proportions.
The scientific method is a set of procedures used to develop explanations of natural phenomena and possibly to predict additional phenomena. For example,
The average temperature of seawater increases, the seawater will become less dense, its volume will increase, and sea level will rise even if no continental ice melts.
Chemistry zimsec chapter 2 atoms, molecules and stoichiometryalproelearning
This document provides an overview of Chapter 2 in a chemistry textbook, which covers topics including:
- The mass of atoms and molecules, including relative atomic mass and molecular mass
- Using a mass spectrometer to determine relative isotopic masses and abundances
- The mole concept and amount of substance in relation to mass, volume of gases, and concentration of solutions
- Calculating empirical formulas from combustion data or elemental composition by mass and deducing molecular formulas
- Stoichiometry, including writing balanced chemical equations and ionic equations
Mathematics: The Basic Tool in Understanding PhysicsJunhel Dalanon
The document discusses various measurement units and systems including metric and English/imperial units. It provides examples of converting between units for length, mass, volume, temperature and other quantities. Dimensional analysis is introduced as a method for solving measurement conversion problems by analyzing the units involved. Word problems combining multiple conversion steps are presented as practice examples.
This document provides an overview of key concepts in introductory chemistry. It discusses three perspectives for understanding chemical systems: macroscopic, microscopic, and symbolic. It also covers the scientific method, properties of matter, phases of matter, chemical vs physical changes, the particulate nature of matter, and the use of measurements, units, and significant figures in chemistry. Example problems are provided to illustrate concepts like ratios, conceptual understanding of particles, and visualizing phenomena at different levels.
This document discusses gases and the Kinetic Molecular Theory (KMT). It defines important characteristics of gases such as being highly compressible and having low densities. It also lists measurable properties of gases like pressure, volume, and temperature and their units. The KMT makes assumptions about gas particles being in constant random motion, having negligible actual volume, and not attracting or repelling each other. The KMT also assumes elastic collisions and that average kinetic energy is directly proportional to Kelvin temperature. A gas that follows all KMT postulates is considered an ideal gas.
This document provides an overview of key concepts in chemistry including definitions of matter, physical and chemical properties, states of matter, and energy. It discusses the scientific approach of developing models through observation, hypothesis, experimentation, and further testing. Measurement concepts such as units, conversions, uncertainty, and significant figures are explained. Examples demonstrate solving problems involving unit conversions, density calculations, and determining the number of significant figures. Fundamental chemistry topics like the periodic table, bonding, and reactions are introduced.
This document provides an overview of key concepts from the first chapter of a chemistry textbook, including:
- Chemistry is the study of matter, its properties, and changes in matter.
- There are three states of matter - solids, liquids, and gases - which are distinguished by their physical properties. Changes in state are physical changes.
- Chemical and physical properties are introduced, along with the distinction between physical and chemical changes.
- Concepts of energy, including potential and kinetic energy, are covered. Energy changes that occur during physical and chemical processes are discussed.
- Measurement and problem solving in chemistry are addressed, including the use of units and conversion factors to calculate quantities.
This document provides an overview of key concepts in chemistry covered in Chapter 1 of the textbook "Chemistry: The Molecular Nature of Matter and Change". It defines chemistry as the study of matter, its properties, and changes in matter. Key topics covered include the states of matter, physical and chemical properties, physical and chemical changes, energy, measurement, and units. Sample problems demonstrate how to solve for quantities like density, mass, volume, and conversions between metric and other units.
This document provides an overview of key concepts in chemistry covered in Chapter 1 of the textbook "Chemistry: The Molecular Nature of Matter and Change". It defines chemistry as the study of matter, its properties, and changes in matter. Key topics covered include the states of matter, physical and chemical properties, physical and chemical changes, energy, measurement, and units. Sample problems demonstrate how to solve for quantities like density, mass, volume, and conversions between metric and other units.
This document provides an overview of key concepts in chemistry covered in Chapter 1 of the textbook "Chemistry: The Molecular Nature of Matter and Change". It defines chemistry as the study of matter, its properties, and changes in matter. Key topics covered include the states of matter, physical and chemical properties, physical and chemical changes, energy, measurement, and units. Sample problems demonstrate how to solve for quantities like density, mass, volume, and conversions between metric and other units.
1. Chemistry is the study of matter and its properties and changes. It impacts many areas including health, energy, materials, food and agriculture.
2. Matter can be classified as elements, compounds or mixtures. Elements cannot be broken down further, compounds are made of two or more elements chemically bonded together, and mixtures maintain their individual identities.
3. The three main states of matter are solids, liquids, and gases. Physical and chemical changes alter or do not alter the composition of matter. The scientific method is used to study chemistry through observation, hypothesis, experimentation and theory development.
The document reviews key concepts for the third quarter assessment including the scientific method, bonding, naming compounds and ions, mixtures, the mole, energy diagrams, phases of matter, reaction rates, and gas laws. It provides examples and explanations of important terms and concepts to help students prepare.
The document provides information on various chemistry topics including converting between temperature scales, calculating density from mass and dimensions, and summarizing the goals and agenda for an upcoming chemistry lab on safe pipetting techniques and using spreadsheet programs. Safety protocols and assignments due for the course are also mentioned.
1. The document discusses units of measurement and conversions between units. It covers the English and metric systems as well as the International System of Units (SI units).
2. Key concepts covered include conversion factors, dimensional analysis to perform unit conversions, and conversions between temperature scales like Celsius, Fahrenheit and Kelvin.
3. Other topics summarized are density and its units, significant figures and how they determine the precision of measurements, and scientific notation for writing very large and small numbers. Worked examples are provided for each concept.
This document provides information about Chemistry 151, including the instructor's contact information, expectations for the course, and an overview of course materials. Some key points:
- Chemistry 151 is for science and engineering majors and requires concurrent enrollment in the lab section. Students must be enrolled in both the lecture and lab to receive credit.
- The textbook and online access code can be purchased bundled from the bookstore or the access code can be purchased separately online.
- The instructor's office hours and expectations for the course are outlined, including attending all lectures, keeping up with readings and problems, and preparing for exams. Support resources are also listed.
Capítulos 1 y 2 del libro de química de changyesu90uy
This document provides an overview of the development of atomic theory and models of the atom. It discusses key discoveries and experiments including:
- Dalton's atomic theory from 1808 that proposed atoms as fundamental particles and that elements are composed of unique atoms.
- J.J. Thomson's discovery in 1906 that the cathode rays were composed of negatively charged particles (electrons) much lighter than atoms.
- Rutherford's gold foil experiment from 1911 that showed the positive charge and most of the mass of atoms are concentrated in a very small nucleus.
- Chadwick's discovery of the neutron in 1932, which has no charge and a mass similar to protons.
- The modern definitions of atomic number as
This document provides an overview of measurement and the scientific method. It discusses how measurement is essential to understanding the physical world and describes some sophisticated methods that have been developed. The document also introduces the metric and British systems of units as well as the International System of Units. Key concepts covered include the scientific method, significant figures, and unit conversions using conversion factors.
This document provides an overview of key concepts in the unit on matter, including:
1. It defines matter as anything that has mass and volume, and discusses the states of matter (solid, liquid, gas, plasma), physical and chemical properties, and physical and chemical changes.
2. It explains the difference between elements, compounds, atoms, and molecules, and discusses measurement units and dimensional analysis.
3. It covers concepts like specific heat, calorimetry, phase change diagrams, and Archimedes' principle for determining density.
This document provides an overview of key concepts from Chapter 1 of a chemistry textbook, including:
- Chemistry is the scientific study of matter and its transformations. It involves elements, molecules, compounds, and changes in their composition and structure.
- Early studies of matter transitioned from alchemy to modern chemistry through scientific pioneers like Antoine Lavoisier who established principles like the law of conservation of mass.
- The scientific method involves making observations, forming hypotheses, conducting experiments, and analyzing results.
- Matter exists in solid, liquid, and gas states and undergoes physical and chemical changes that do or do not alter its composition.
- Proper measurement in chemistry requires both a number and
A physical change alters a substance without changing its chemical identity. During a physical change, no new substance is created and no new chemical bonds form. Examples of physical changes include phase changes like melting, freezing, and vaporization, as well as dissolving and mixing substances that do not undergo chemical reactions.
1. This document provides an overview of key concepts in physical science measurements including the International System of Units (SI), units of measurement, prefixes, and measurement techniques.
2. The SI system establishes standard units for measuring common physical properties including the meter for length, kilogram for mass, second for time, kelvin for temperature, ampere for electric current, mole for amount of substance, and candela for luminous intensity.
3. Proper measurement requires selecting the appropriate unit and precision based on the quantity and tool. Data is organized and compared using tables, graphs, and applying statistical concepts like mean and percent error.
This document provides an overview of chemistry concepts including:
- Chemistry is the study of matter and its properties, covering topics like health, energy, materials, food and more.
- Matter is anything that has mass and takes up space, and can exist as elements, compounds and mixtures.
- Chemical and physical changes alter substances in different ways. The document also introduces concepts such as states of matter, properties of matter, units of measurement, and dimensional analysis.
Similar to New chm-151-unit-1-20powerpoints-20sp13s-140227172225-phpapp01 (20)
This document discusses suffixes and terminology used in medicine. It begins by listing common combining forms used to build medical terms and their meanings. It then defines several noun, adjective, and shorter suffixes and provides their meanings. Examples are given of medical terms built using combining forms and suffixes. The document also examines specific medical concepts in more depth, such as hernias, blood cells, acromegaly, splenomegaly, and laparoscopy.
The document is a chapter from a medical textbook that discusses anatomical terminology pertaining to the body as a whole. It defines the structural organization of the body from cells to tissues to organs to systems. It also describes the body cavities and identifies the major organs contained within each cavity, as well as anatomical divisions of the abdomen and back.
This document is from a textbook on medical terminology. It discusses the basic structure of medical words and how they are built from prefixes, suffixes, and combining forms. Some key points:
- Medical terms are made up of elements including roots, suffixes, prefixes, and combining vowels. Understanding these elements is important for analyzing terms.
- Common prefixes include hypo-, epi-, and cis-. Common suffixes include -itis, -algia, and -ectomy.
- Dozens of combining forms are provided, such as gastro- meaning stomach, cardi- meaning heart, and aden- meaning gland.
- Rules are provided for analyzing terms, such as reading from the suffix backward and dropping combining vowels before suffixes starting with vowels
This document is the copyright information for Chapter 25 on Cancer from the 6th edition of the textbook Molecular Cell Biology published in 2008 by W. H. Freeman and Company. The chapter was authored by a team that includes Lodish, Berk, Kaiser, Krieger, Scott, Bretscher, Ploegh, and Matsudaira.
This document is the copyright information for Chapter 24 on Immunology from the 6th edition of the textbook Molecular Cell Biology published in 2008 by W. H. Freeman and Company. The chapter was authored by Lodish, Berk, Kaiser, Krieger, Scott, Bretscher, Ploegh, and Matsudaira.
Nerve cells, also known as neurons, are highly specialized cells that process and transmit information through electrical and chemical signals. This chapter discusses the structure and function of neurons, how they communicate with each other via synapses, and how signals are propagated along neurons through changes in their membrane potentials. Neurons play a vital role in the nervous system by allowing organisms to process information and coordinate their responses.
This document is the copyright information for Chapter 22 from the 6th edition of the textbook "Molecular Cell Biology" published in 2008 by W. H. Freeman and Company. The chapter is titled "The Molecular Cell Biology of Development" and is authored by Lodish, Berk, Kaiser, Krieger, Scott, Bretscher, Ploegh, and Matsudaira.
This document is the copyright information for Chapter 21 from the sixth edition of the textbook "Molecular Cell Biology" published in 2008 by W. H. Freeman and Company. The chapter is titled "Cell Birth, Lineage, and Death" and is authored by Lodish, Berk, Kaiser, Krieger, Scott, Bretscher, Ploegh, and Matsudaira.
This document is the copyright page for Chapter 20 from the 6th edition of the textbook "Molecular Cell Biology" published in 2008 by W. H. Freeman and Company. The chapter is titled "Regulating the Eukaryotic Cell Cycle" and is authored by a group of scientists including Lodish, Berk, Kaiser, Krieger, Scott, Bretscher, Ploegh, and Matsudaira.
This document is the copyright information for Chapter 19 from the 6th edition textbook "Molecular Cell Biology" published in 2008 by W. H. Freeman and Company. The chapter is titled "Integrating Cells into Tissues" and is authored by Lodish, Berk, Kaiser, Krieger, Scott, Bretscher, Ploegh, and Matsudaira.
This chapter discusses microtubules and intermediate filaments, which are types of cytoskeletal filaments that help organize and move cellular components. Microtubules are involved in processes like cell division and intracellular transport, while intermediate filaments provide mechanical strength and help integrate the nucleus with the cytoplasm. Together, these filaments play important structural and functional roles in eukaryotic cells.
This chapter discusses microfilaments, which are one of the three main types of cytoskeletal filaments found in eukaryotic cells. Microfilaments are composed of actin filaments and play important roles in cell motility, structure, and intracellular transport. They allow cells to change shape and to move by contracting or extending parts of the cell surface.
This document is the copyright page for Chapter 16 from the 6th edition of the textbook "Molecular Cell Biology" published in 2008 by W. H. Freeman and Company. The chapter is titled "Signaling Pathways that Control Gene Activity" and is authored by a group of scientists including Lodish, Berk, Kaiser, Krieger, Scott, Bretscher, Ploegh and Matsudaira.
This document is the copyright page for Chapter 15 of the 6th edition textbook "Molecular Cell Biology" by Lodish, Berk, Kaiser, Krieger, Scott, Bretscher, Ploegh, and Matsudaira. It provides the chapter title "Cell Signaling I: Signal Transduction and Short-Term Cellular Responses" and notes the copyright is held by W. H. Freeman and Company in 2008.
This document is the copyright page for Chapter 14 from the 6th edition textbook "Molecular Cell Biology" published in 2008 by W. H. Freeman and Company. The chapter is titled "Vesicular Traffic, Secretion, and Endocytosis" and is authored by a group of scientists including Lodish, Berk, Kaiser, Krieger, Scott, Bretscher, Ploegh and Matsudaira.
This chapter discusses how proteins are transported into membranes and organelles within cells. Proteins destined for membranes or organelles have targeting signals that are recognized by transport systems. The transport systems then direct the proteins to their proper destinations, such as inserting membrane proteins into membranes or delivering soluble proteins into organelles.
This document is the copyright information for Chapter 12 from the sixth edition of the textbook "Molecular Cell Biology" published in 2008 by W. H. Freeman and Company. The chapter is titled "Cellular Energetics" and is authored by Lodish, Berk, Kaiser, Krieger, Scott, Bretscher, Ploegh, and Matsudaira.
This chapter discusses the transmembrane transport of ions and small molecules across cell membranes. It covers topics such as passive transport through membrane channels and pumps, as well as active transport using ATP. The chapter is from the 6th edition of the textbook Molecular Cell Biology and is copyrighted by W. H. Freeman and Company in 2008.
This document is the copyright information for Chapter 10, titled "Biomembrane Structure", from the sixth edition of the textbook "Molecular Cell Biology" published in 2008 by W. H. Freeman and Company. The chapter was written by a team of authors including Lodish, Berk, Kaiser, Krieger, Scott, Bretscher, Ploegh and Matsudaira.
This document is the copyright information for Chapter 9 from the 6th edition of the textbook "Molecular Cell Biology" published in 2008 by W. H. Freeman and Company. The chapter is titled "Visualizing, Fractionating, and Culturing Cells" and is authored by Lodish, Berk, Kaiser, Krieger, Scott, Bretscher, Ploegh, and Matsudaira.
Beyond Degrees - Empowering the Workforce in the Context of Skills-First.pptxEduSkills OECD
Iván Bornacelly, Policy Analyst at the OECD Centre for Skills, OECD, presents at the webinar 'Tackling job market gaps with a skills-first approach' on 12 June 2024
How to Make a Field Mandatory in Odoo 17Celine George
In Odoo, making a field required can be done through both Python code and XML views. When you set the required attribute to True in Python code, it makes the field required across all views where it's used. Conversely, when you set the required attribute in XML views, it makes the field required only in the context of that particular view.
This presentation was provided by Racquel Jemison, Ph.D., Christina MacLaughlin, Ph.D., and Paulomi Majumder. Ph.D., all of the American Chemical Society, for the second session of NISO's 2024 Training Series "DEIA in the Scholarly Landscape." Session Two: 'Expanding Pathways to Publishing Careers,' was held June 13, 2024.
This document provides an overview of wound healing, its functions, stages, mechanisms, factors affecting it, and complications.
A wound is a break in the integrity of the skin or tissues, which may be associated with disruption of the structure and function.
Healing is the body’s response to injury in an attempt to restore normal structure and functions.
Healing can occur in two ways: Regeneration and Repair
There are 4 phases of wound healing: hemostasis, inflammation, proliferation, and remodeling. This document also describes the mechanism of wound healing. Factors that affect healing include infection, uncontrolled diabetes, poor nutrition, age, anemia, the presence of foreign bodies, etc.
Complications of wound healing like infection, hyperpigmentation of scar, contractures, and keloid formation.
The chapter Lifelines of National Economy in Class 10 Geography focuses on the various modes of transportation and communication that play a vital role in the economic development of a country. These lifelines are crucial for the movement of goods, services, and people, thereby connecting different regions and promoting economic activities.
Level 3 NCEA - NZ: A Nation In the Making 1872 - 1900 SML.pptHenry Hollis
The History of NZ 1870-1900.
Making of a Nation.
From the NZ Wars to Liberals,
Richard Seddon, George Grey,
Social Laboratory, New Zealand,
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Chapter wise All Notes of First year Basic Civil Engineering.pptxDenish Jangid
Chapter wise All Notes of First year Basic Civil Engineering
Syllabus
Chapter-1
Introduction to objective, scope and outcome the subject
Chapter 2
Introduction: Scope and Specialization of Civil Engineering, Role of civil Engineer in Society, Impact of infrastructural development on economy of country.
Chapter 3
Surveying: Object Principles & Types of Surveying; Site Plans, Plans & Maps; Scales & Unit of different Measurements.
Linear Measurements: Instruments used. Linear Measurement by Tape, Ranging out Survey Lines and overcoming Obstructions; Measurements on sloping ground; Tape corrections, conventional symbols. Angular Measurements: Instruments used; Introduction to Compass Surveying, Bearings and Longitude & Latitude of a Line, Introduction to total station.
Levelling: Instrument used Object of levelling, Methods of levelling in brief, and Contour maps.
Chapter 4
Buildings: Selection of site for Buildings, Layout of Building Plan, Types of buildings, Plinth area, carpet area, floor space index, Introduction to building byelaws, concept of sun light & ventilation. Components of Buildings & their functions, Basic concept of R.C.C., Introduction to types of foundation
Chapter 5
Transportation: Introduction to Transportation Engineering; Traffic and Road Safety: Types and Characteristics of Various Modes of Transportation; Various Road Traffic Signs, Causes of Accidents and Road Safety Measures.
Chapter 6
Environmental Engineering: Environmental Pollution, Environmental Acts and Regulations, Functional Concepts of Ecology, Basics of Species, Biodiversity, Ecosystem, Hydrological Cycle; Chemical Cycles: Carbon, Nitrogen & Phosphorus; Energy Flow in Ecosystems.
Water Pollution: Water Quality standards, Introduction to Treatment & Disposal of Waste Water. Reuse and Saving of Water, Rain Water Harvesting. Solid Waste Management: Classification of Solid Waste, Collection, Transportation and Disposal of Solid. Recycling of Solid Waste: Energy Recovery, Sanitary Landfill, On-Site Sanitation. Air & Noise Pollution: Primary and Secondary air pollutants, Harmful effects of Air Pollution, Control of Air Pollution. . Noise Pollution Harmful Effects of noise pollution, control of noise pollution, Global warming & Climate Change, Ozone depletion, Greenhouse effect
Text Books:
1. Palancharmy, Basic Civil Engineering, McGraw Hill publishers.
2. Satheesh Gopi, Basic Civil Engineering, Pearson Publishers.
3. Ketki Rangwala Dalal, Essentials of Civil Engineering, Charotar Publishing House.
4. BCP, Surveying volume 1
LAND USE LAND COVER AND NDVI OF MIRZAPUR DISTRICT, UPRAHUL
This Dissertation explores the particular circumstances of Mirzapur, a region located in the
core of India. Mirzapur, with its varied terrains and abundant biodiversity, offers an optimal
environment for investigating the changes in vegetation cover dynamics. Our study utilizes
advanced technologies such as GIS (Geographic Information Systems) and Remote sensing to
analyze the transformations that have taken place over the course of a decade.
The complex relationship between human activities and the environment has been the focus
of extensive research and worry. As the global community grapples with swift urbanization,
population expansion, and economic progress, the effects on natural ecosystems are becoming
more evident. A crucial element of this impact is the alteration of vegetation cover, which plays a
significant role in maintaining the ecological equilibrium of our planet.Land serves as the foundation for all human activities and provides the necessary materials for
these activities. As the most crucial natural resource, its utilization by humans results in different
'Land uses,' which are determined by both human activities and the physical characteristics of the
land.
The utilization of land is impacted by human needs and environmental factors. In countries
like India, rapid population growth and the emphasis on extensive resource exploitation can lead
to significant land degradation, adversely affecting the region's land cover.
Therefore, human intervention has significantly influenced land use patterns over many
centuries, evolving its structure over time and space. In the present era, these changes have
accelerated due to factors such as agriculture and urbanization. Information regarding land use and
cover is essential for various planning and management tasks related to the Earth's surface,
providing crucial environmental data for scientific, resource management, policy purposes, and
diverse human activities.
Accurate understanding of land use and cover is imperative for the development planning
of any area. Consequently, a wide range of professionals, including earth system scientists, land
and water managers, and urban planners, are interested in obtaining data on land use and cover
changes, conversion trends, and other related patterns. The spatial dimensions of land use and
cover support policymakers and scientists in making well-informed decisions, as alterations in
these patterns indicate shifts in economic and social conditions. Monitoring such changes with the
help of Advanced technologies like Remote Sensing and Geographic Information Systems is
crucial for coordinated efforts across different administrative levels. Advanced technologies like
Remote Sensing and Geographic Information Systems
9
Changes in vegetation cover refer to variations in the distribution, composition, and overall
structure of plant communities across different temporal and spatial scales. These changes can
occur natural.
How to Setup Warehouse & Location in Odoo 17 InventoryCeline George
In this slide, we'll explore how to set up warehouses and locations in Odoo 17 Inventory. This will help us manage our stock effectively, track inventory levels, and streamline warehouse operations.
How to Setup Warehouse & Location in Odoo 17 Inventory
New chm-151-unit-1-20powerpoints-20sp13s-140227172225-phpapp01
1. Keys to the Study of Chemistry
• Ashton T. Griffin
• Wayne Community College
• Chapter 1.1-1.6 in Silberberg 5th and 6th editions.
2. Goals & Objectives
• The student will be able to identify the name
and symbol of the first 36 elements on the
periodic table. (I-1)
• The student will understand the common units
of length, volume, mass, and temperature and
their numerical prefixes. (1.5)
3. Goals & Objectives
• The student will understand the meaning of
uncertainty in measurements and the use of
significant figures and rounding. (1.6)
• The student will understand the distinction
between accuracy and precision and between
systematic and random error. (1.6)
4. Master these Skills
• The student will be able to:
• Use conversion factors in calculations (1.4; SP
1.3-1.5)
• Find the density from mass and volume (SP
1.6)
• Convert between the Kelvin, Celsius, and
Fahrenheit temperature scales (SP 1.7)
5. Master these Skills
• The student will be able to:
• Determine the number of significant figures
(SP 1.8) and rounding to the correct number of
digits. (SP 1.9)
6. Chemistry is the study of matter,
its properties,
the changes that matter undergoes,
and
the energy associated with these changes.
Chemistry
7. Definitions
Matter anything that has both mass and volume
- the “stuff” of the universe: books, planets,
trees, professors, students
Composition the types and amounts of simpler
substances that make up a sample of
matter
Properties the characteristics that give each substance a
unique identity
8. Physical Properties
properties a substance shows by itself without
interacting with another substance
- color, melting point, boiling point, density
Chemical Properties
properties a substance shows as it interacts
with, or transforms into, other substances
- flammability, corrosiveness
9. Figure 1.1 The distinction between physical and chemical change.
11. Elements
• The simplest forms of matter
• Cannot be separated by chemical means into
simpler stable substances
• Represented by symbols on the Periodic Table
• Learn the names and symbols for first 36
elements (I-1)
12. The States of Matter
A solid has a fixed shape and volume. Solids may be hard
or soft, rigid or flexible.
A liquid has a varying shape that conforms to the shape of
the container, but a fixed volume. A liquid has an upper
surface.
A gas has no fixed shape or volume and therefore does not
have a surface.
14. • A change of state is a physical change.
– Physical form changes, composition does not.
• Changes in physical state are reversible
– by changing the temperature.
• A chemical change cannot simply be reversed by a change in
temperature.
Temperature and Change of State
15. Sample Problem 1.2 Distinguishing Between Physical
and Chemical Change
PROBLEM: Decide whether each of the following processes is
primarily a physical or a chemical change, and explain
briefly:
(a) Frost forms as the temperature drops on a humid winter night.
(b) A cornstalk grows from a seed that is watered and fertilized.
(c) A match ignites to form ash and a mixture of gases.
(d) Perspiration evaporates when you relax after jogging.
(e) A silver fork tarnishes slowly in air.
PLAN: “Does the substance change composition or just change
form?”
16. SOLUTION:
physical change
chemical change
(a) Frost forms as the temperature drops on a humid winter night.
(b) A cornstalk grows from a seed that is watered and fertilized.
(c) A match ignites to form ash and a mixture of gases.
(d) Perspiration evaporates when you relax after jogging.
(e) A silver fork tarnishes slowly in air.
chemical change
physical change
chemical change
Sample Problem 1.2
17. Energy in Chemistry
Energy is the ability to do work.
Potential Energy
is energy due to the position of an object.
Kinetic Energy
is energy due to the movement of an object.
Total Energy = Potential Energy + Kinetic Energy
18. Energy Changes
Lower energy states are more stable and are favored
over higher energy states.
Energy is neither created nor destroyed
– it is conserved
– and can be converted from one form to another.
19. Figure 1.6 The scientific approach to understanding nature.
Observations Natural phenomena and measured
events; can be stated as a natural law if
universally consistent.
Tentative proposal that explains
observations.
Hypothesis
Experiment Procedure to test hypothesis; measures
one variable at a time.
Model (Theory)
Set of conceptual assumptions that
explains data from accumulated
experiments; predicts related phenomena.
Further
Experiment
Tests predictions based on
model
Model is altered if
predicted events do
not support it.
Hypothesis is
revised if
experimental results
do not support it.
20. • All measured quantities consist of
– a number and a unit.
• Units are manipulated like numbers:
– 3 ft x 4 ft = 12 ft2
–
Chemical Problem Solving
350 mi
7 h
= 50 mi
1 h
or 50 mi.h-1
21. Conversion Factors
1 mi
5280 ft
=
5280 ft
5280 ft
A conversion factor is a ratio of equivalent quantities
used to express a quantity in different units.
The relationship 1 mi = 5280 ft
gives us the conversion factor:
= 1
22. A conversion factor is chosen and set up so that all
units cancel except those required for the answer.
PROBLEM: The height of the Angel Falls is 3212 ft. Express this
quantity in miles (mi) if 1 mi = 5280 ft.
1 mi
5280 ft
= 0.6083 mi3212 ft x
PLAN: Set up the conversion factor so that ft will cancel and the
answer will be in mi.
SOLUTION:
23. Systematic Approach to Solving Chemistry Problems
• State Problem
• Plan
• Solution
• Check
• Comment
• Follow-up Problem
Clarify the known and unknown.
Suggest steps from known to unknown.
Prepare a visual summary of steps
that includes conversion factors,
equations, known variables.
24. Sample Problem 1.3 Converting Units of Length
PROBLEM: To wire your stereo equipment, you need 325 centimeters
(cm) of speaker wire that sells for $0.15/ft. What is the
price of the wire?
PLAN: We know the length (in cm) of wire and cost per length
($/ft). We have to convert cm to inches and inches to feet.
Then we can find the cost for the length in feet.
2.54 cm = 1 in
length (cm) of wire
length (in) of wire
12 in = 1 ft
1 ft = $0.15
length (ft) of wire
Price ($) of wire
25. Sample Problem 1.3
SOLUTION:
Length (in) = length (cm) x conversion factor
Length (ft) = length (in) x conversion factor
Price ($) = length (ft) x conversion factor
= 325 cm x = 128 in
1 in
2.54 cm
= 128 in x = 10.7 ft
1 ft
12 in
= 10.7 ft x
$ 0.15
1 ft
= $ 1.60
26. Table 1. 2 SI Base Units
Physical Quantity
(Dimension)
Unit Name Unit Abbreviation
Mass kilogram kg
Length meter m
Time second s
Temperature kelvin K
Electric Current ampere A
Amount of substance mole mol
Luminous intensity candela cd
27. Units -- Metric System
Mass kilogram(kg), gram(g)
Length meter(m), centimeter(cm)
Volume cubic meter(m3),
cubic centimeter (cm3)
liter(L) = 1000 cm3 (exact)
milliliter(mL) = 1 cm3 (exact)
28. Additional SI Units
• Current – Ampere
• Amount of Substance – Mole
• Luminous Intensity – Candela
• Four of these units are of particular interest to
chemist.
29. The Second
• Initially the second was tied to the Earth’s
rotation. 1/86,400th of the mean solar day.
• In 1967, the second was based on the cesium-
133 atomic clock.
30. The Meter
• In 1791, the meter was defined to be one ten-
millionth of the length of the meridian passing
through Paris from the equator to the North
Pole.
• In 1889, a platinum-iridium bar was inscribed
with two lines – this became the standard for
the meter.
31. The Meter (continued)
• In 1960, the meter was based on the
wavelength of krypton-86 radiation.
• Finally in 1983, the meter was re-defined as
the length traveled by light in exactly
1/299,792,458 of a second.
32. The Kilogram
• In 1799, a platinum-iridium cylinder was
fabricated to represent the mass of a cubic
deciliter of water at 4 C. In new standard was
created in 1879. Due to the changing nature
its mass, it was suggested in 2005 that the
kilogram be redefined in terms of “fixed
constants of nature”.
34. The Mole
• Since the 1960’s, the mole has been based on
the number of atoms in 12.0 g of carbon-12 or
6.022 x 1023 atoms.
• New attempts to define the mole include
using a new standard Si-28.
• New attempts will continue.
36. Units-- Metric System
Use numerical prefixes for larger or smaller
units:
Mega (M) 1000000 times unit (106)
kilo (k) 1000 times unit (103)
centi (c) 0.01 times unit (10-2)
milli (m) 0.001 times unit (10-3)
Micro (µ) 0.000001 times unit (10-6)
37. Table 1.4 Common SI-English Equivalent Quantities
Quantity SI to English Equivalent English to SI Equivalent
Length 1 km = 0.6214 mile
1 m = 1.094 yard
1 m = 39.37 inches
1 cm = 0.3937 inch
1 mi = 1.609 km
1 yd = 0.9144 m
1 ft = 0.3048 m
1 in = 2.54 cm
Volume 1 cubic meter (m3) = 35.31 ft3
1 dm3 = 0.2642 gal
1 dm3 = 1.057 qt
1 cm3 = 0.03381 fluid ounce
1 ft3 = 0.02832 m3
1 gal = 3.785 dm3
1 qt = 0.9464 dm3
1 qt = 946.4 cm3
1 fluid ounce = 29.57 cm3
Mass 1 kg = 2.205 lb
1 g = 0.03527 ounce (oz)
1 lb = 0.4536 kg
1 oz = 28.35 g
39. Sample Problem 1.4 Converting Units of Volume
PROBLEM: A graduated cylinder contains 19.9 mL of water. When a
small piece of galena, an ore of lead, is added, it sinks
and the volume increases to 24.5 mL. What is the
volume of the piece of galena in cm3 and in L?
PLAN: The volume of the galena is equal to the difference in the
volume of the water before and after the addition.
subtract
volume (mL) before and after
volume (mL) of galena
1 mL = 1 cm3
volume (cm3)
of galena
volume (L)
of galena
1 mL = 10-3 L
40. SOLUTION:
(24.5 - 19.9) mL = volume of galena = 4.6 mL
Sample Problem 1.4
= 4.6 cm34.6 mL x
1 cm3
1 mL
4.6 mL x
10-3 L
1 mL
= 4.6 x 10-3 L
41. Sample Problem 1.5 Converting Units of Mass
PROBLEM: Many international computer communications are carried out
by optical fibers in cables laid along the ocean floor. If one
strand of optical fiber weighs 1.19 x 10-3 lb/m, what is the
mass (in kg) of a cable made of six strands of optical fiber,
each long enough to link New York and Paris (8.94 x 103
km)?
PLAN: The sequence of steps may vary but essentially we need to
find the length of the entire cable and convert it to mass.
1 km = 103 m
length (km) of fiber
length (m) of fiber
1 m = 1.19 x 10-3 lb
6 fibers = 1 cable
mass (lb) of fiber
Mass (kg) of cablemass (lb) of cable
2.205 lb = 1 kg
42. Sample Problem 1.5
SOLUTION:
8.84 x 103 km x = 8.84 x 106 m
103 m
1 km
8.84 x 106 m x = 1.05 x 104 lb
1.19 x 10-3 lb
1 m
= 6.30 x 104 lb/cable
6 fibers
1 cable
1.05 x 104 lb
1 fiber
x
= 2.86 x 104 kg/cable
1 kg
2.205 lb
6.30 x 104 lb
1 cable
x
43. Units -- Metric System
• Numerical Prefixes:
– 12.5 m = _______ cm
– 1.35 kg = _______ g
– 0.0256 mm = _______ µm
– 89.7 megahertz = _______ hertz
(1 hertz = 1 cycle per second)
44.
45.
46.
47. Derived Quantities
• Frequency (cycles/s, hertz)
• Density (mass/volume, g/cm3)
• Speed (distance/time, m/s)
• Acceleration (distance/(time)2, m/s2)
• Force (mass x acceleration, kg•m/s2, newton)
• Pressure (force/area, kg/(m•s2), pascal)
• Energy (force x distance, kg•m2/s2, joule)
49. Density
mass
volume
density =
At a given temperature and pressure, the density of a
substance is a characteristic physical property and has a
specific value.
50. Densities of Some Common Substances*Table 1.5
*At room temperature (20°C) and normal atmospheric pressure (1atm).
Substance Physical State Density (g/cm3)
Hydrogen gas 0.0000899
Oxygen gas 0.00133
Grain alcohol liquid 0.789
Water liquid 0.998
Table salt solid 2.16
Aluminum solid 2.70
Lead solid 11.3
Gold solid 19.3
51. Sample Problem 1.6 Calculating Density from Mass and Length
PROBLEM: Lithium, a soft, gray solid with the lowest density of any
metal, is a key component of advanced batteries. A slab
of lithium weighs 1.49x103 mg and has sides that are
20.9 mm by 11.1 mm by 11.9 mm. Find the density of
lithium in g/cm3.
PLAN: Density is expressed in g/cm3 so we need the mass in g
and the volume in cm3.
10 mm = 1 cm
divide mass by volume
lengths (mm) of sides
lengths (cm) of sidesmass (mg) of Li
mass (g) of Li
103 mg = 1 g
volume (cm3)
multiply lengths
density (g/cm3) of Li
52. Sample Problem 1.6
SOLUTION:
Similarly the other sides will be 1.11 cm and 1.19 cm, respectively.
Volume = 2.09 x 1.11 x 1.19 = 2.76 cm3
= 0.540 g/cm3
= 1.49 g1.49x103 mg x
1 g
103 mg
= 2.09 cm20.9 mm x
1 cm
10 mm
density of Li =
1.49 g
2.76 cm3
53. Dimensional Analysis
• Derived quantities - Density
Determine the density of a substance(g/ml) if
742g of it occupies 97.3 cubic centimeters.
Determine the volume of a liquid having a
density of 1.32 g/mL required to have 125 g of
the liquid.
60. Temperature Scales
Kelvin ( K ) - The “absolute temperature scale” begins at
absolute zero and has only positive values. Note that the kelvin is
not used with the degree sign (°).
Celsius ( o
C ) - The Celsius scale is based on the freezing and
boiling points of water. This is the temperature scale used most
commonly around the world. The Celsius and Kelvin scales use
the same size degree although their starting points differ.
Fahrenheit ( o
F ) – The Fahrenheit scale is commonly used in
the US. The Fahrenheit scale has a different degree size and
different zero points than both the Celsius and Kelvin scales.
61. Temperature Conversions
T (in K) = T (in oC) + 273.15
T (in oC) = T (in K) - 273.15
T (in °F) = T (in °C) + 329
5
5
9
T (in °C) = [T (in °F) – 32]
62. Sample Problem 1.7 Converting Units of Temperature
PROBLEM: A child has a body temperature of 38.7°C, and normal
body temperature is 98.6°F. Does the child have a fever?
What is the child’s temperature in kelvins?
PLAN: We have to convert °C to °F to find out if the child has a
fever. We can then use the °C to Kelvin relationship to find
the temperature in Kelvin.
SOLUTION:
Converting from °C to °F
9
5
(38.7 °C) + 32 = 101.7 °F
Converting from °C to K 38.7 °C + 273.15 = 311.8 K
Yes, the child has a fever.
63. Significant Figures
Every measurement includes some uncertainty. The
rightmost digit of any quantity is always estimated.
The recorded digits, both certain and uncertain, are called
significant figures.
The greater the number of significant figures in a quantity,
the greater its certainty.
64. The number of significant figures in a measurement.Figure 1.12
65. Determining Which Digits are Significant
All digits are significant
- except zeros that are used only to position the
decimal point.
• Make sure the measured quantity has a decimal point.
• Start at the left and move right until you reach the first
nonzero digit.
• Count that digit and every digit to its right as significant.
66. • Zeros that end a number are significant
– whether they occur before or after the decimal point
– as long as a decimal point is present.
• 1.030 mL has 4 significant figures.
• 5300. L has 4 significant figures.
• If no decimal point is present
– zeros at the end of the number are not significant.
• 5300 L has only 2 significant figures.
67. Sample Problem 1.8 Determining the Number of Significant Figures
PLAN: We determine the number of significant figures by counting
digits, paying particular attention to the position of zeros in
relation to the decimal point, and underline zeros that are
significant.
PROBLEM: For each of the following quantities, underline the zeros
that are significant figures (sf), and determine the number
of significant figures in each quantity. For (d) to (f),
express each in exponential notation first.
(b) 0.1044 g(a) 0.0030 L (c) 53,069 mL
(e) 57,600. s(d) 0.00004715 m (f) 0.0000007160 cm3
68. Sample Problem 1.8
SOLUTION:
(a) 0.0030 L has 2 sf (b) 0.1044 g has 4 sf
(c) 53,069 mL has 5 sf
(d) 0.00004715 m = 4.715x10-5 m has 4 sf
(e) 57,600. s = 5.7600x104 s has 5 sf
(f) 0.0000007160 cm3 = 7.160x10-7 cm3 has 4 sf
69. = 23.4225 cm3 = 23 cm39.2 cm x 6.8 cm x 0.3744 cm
1. For multiplication and division. The answer contains
the same number of significant figures as there are in the
measurement with the fewest significant figures.
Rules for Significant Figures in Calculations
Multiply the following numbers:
70. Multiplication and Division of Inexact
Numbers
• The result can have no more sig. figs. than the
least number of sig. figs. used to obtain the
result.
4.242 x 1.23 = 5.21766 5.22
12.24/2.0 = 6.12 6.1
71. Multiplication and Division of Inexact and
Exact Numbers
• Use of exact conversion factors retains the
number of sig figs in the measured (inexact)
value.
22.36 inches x 2.54 centimeters per inch=
56.80 centimeters
• Conversion factors involving powers of ten are
always exact.
1 kilometer = 1000 meters
3.5 kilometers = 3.5 x 103 meters
72. Rules for Significant Figures in Calculations
2. For addition and subtraction. The answer has
the same number of decimal places as there are in
the measurement with the fewest decimal places.
106.78 mL = 106.8 mL
Example: subtracting two volumes
863.0879 mL = 863.1 mL
865.9 mL
- 2.8121 mL
Example: adding two volumes 83.5 mL
+ 23.28 mL
73. Addition and Subtraction of Inexact
Numbers
• Result will have a digit as far to the right as all
the numbers have a digit in common
2.02 8.7397
1.234 -2.123
+ 3.6923 6.6167
6.9463
6.95 6.617
74. Rules for Rounding Off Numbers
1. If the digit removed is more than 5, the preceding
number increases by 1.
5.379 rounds to 5.38 if 3 significant figures are retained.
2. If the digit removed is less than 5, the preceding
number is unchanged.
0.2413 rounds to 0.241 if 3 significant figures are
retained.
75. 3. If the digit removed is 5 followed by zeros or
with no following digits, the preceding number
increases by 1 if it is odd and remains unchanged if
it is even.
17.75 rounds to 17.8, but 17.65 rounds to 17.6.
4. Be sure to carry two or more additional significant
figures through a multistep calculation and round off
the final answer only.
If the 5 is followed by other nonzero digits, rule 1
is followed:
17.6500 rounds to 17.6, but 17.6513 rounds to 17.7
76. Rounding Off Numbers
• Rule 1
• If the first digit to be dropped is less than 5,
that digit and all the digits that follow it are
simply dropped.
• Thus, 62.312 rounded off to 3 significant
figures become 62.3.
77. Rounding Off Numbers
• Rule 2
• If the first digit to be dropped is a digit greater
than 5, or a 5 followed by digits other than all
zeros, the excess digits are all dropped and the
last retained digit is increased in value by one
unit.
78. Example of Rule 2
• Thus 62.782 and 62.558 rounded off to 3
significant figures become, respectively, 62.8
and 62.6.
79. Rounding Off Numbers
• Rule 3
• If the first digit to be dropped is a 5 not followed by
any other digit or a 5 followed only by zeros, an
odd-even rule applies. Drop the 5 and any zeros
that follow it and then:
• Increase the last retained digit by one unit if it is odd
and leave the last retained digit the same if it is
even.
80. Example of Rule 3
• Thus, 62.650 and 62.350 rounded to 3
significant figures become, respectively, 62.6
(even rule) and 62.4 (odd rule). The number
zero as a last retained digit is always
considered an even number; thus, 62.050
rounded to 3 significant figures becomes 62.0.
81. Rounding
• Round each of the following numbers to 3
significant figures:
• 12.36
• 125.5
• 89.2532
• 58.22
• 12586.365
• 599.68
82. The measuring device used determines the number of significant
digits possible.
Figure 1.13 Significant figures and measuring devices.
83. Exact numbers have no uncertainty associated with them.
Numbers may be exact by definition:
1000 mg = 1 g
60 min = 1 hr
2.54 cm = 1 in
Exact numbers do not limit the number of
significant digits in a calculation.
Exact Numbers
Numbers may be exact by count:
exactly 26 letters in the alphabet
84. Sample Problem 1.9 Significant Figures and Rounding
PROBLEM: Perform the following calculations and round each answer
to the correct number of significant figures:
PLAN: We use the rules for rounding presented in the text: (a) We
subtract before we divide. (b) We note that the unit
conversion involves an exact number.
7.085 cm
16.3521 cm2 - 1.448 cm2
(a)
11.55 cm3
4.80x104 mg
(b)
1 g
1000 mg
85. Sample Problem 1.9
SOLUTION:
7.085 cm
16.3521 cm2 - 1.448 cm2
(a) =
7.085 cm
14.904 cm2
= 2.104 cm
11.55 cm3
4.80x104 mg
(b)
1 g
1000 mg
=
48.0 g
11.55 cm3
= 4.16 g/ cm3
86. Scientific Notation
• Can be used to express very large or
very small numbers
• Expresses value as A x 10n
1≥A<10, n is an integer
14,345 = 1.4345 x 104
0.009867 = 9.867 x 10-3
87. Scientific Notation
• Is useful for handling significant digits
Express 14,345 to 3 sig. figs.
1.43 x 104
Express 93,000,000 to 4 sig. Fig
9.300 x 107
Express 0.009867 to 2 sig. figs.
9.9 x 10-3 or 0.0099
88. Precision, Accuracy, and Error
Precision refers to how close the measurements in a
series are to each other.
Accuracy refers to how close each measurement is to
the actual value.
Systematic error produces values that are either all
higher or all lower than the actual value.
This error is part of the experimental system.
Random error produces values that are both higher
and lower than the actual value.
89. Figure 1.14
precise and accurate
precise but not accurate
Precision and accuracy in a laboratory calibration.
91. Percentage Problems
Percent is the number of items of a specified
type in a group of 100 total items.
Parts per hundred
Percent = number of items of interest x 100%
total items
92. Percentage Problems
A student answered 19 items correctly on a
23 point test. What was his score as a
percentage?
Percentage
23
19
0 5 10 15 20 25
1
Points on a test
93.
94. Percentage Problems
Range as a percent of the average is a way
to express precision.
% of average = (highest – lowest) x 100%
average
= (20.50 – 19.25) units x 100 % = 6.32%
19.78 units
Measurements and the Average
19.78
19.25
19.60
20.50
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
1
Run#
Measurement Units
95. Percentage Problems
A technician measured the breaking strength of
three samples of plastic. His results were:
Run 1: 65.8 MPa
Run 2: 72.4 MPa
Run 3: 68.3 MPa
What was the range of his measurements
as a percent of the average?
Note: 1 MPa = 145 pounds/in2
96.
97. Percentage Problems
Percent difference is a way to express
accuracy.
% difference = (measured – actual) x 100%
actual
= (19.78 – 20.00) units x 100% = –1.1%
20.00 units
Measured and True values
19.78
20.00
0 1 2 3 4 5 6 7 8 9 1 0 1 1 1 2 1 3 1 4 1 5 1 6 1 7 1 8 1 9 2 0 2 1
Measurement Units
98. Percentage Problems
A student determined the density of aluminum
metal to be 2.64 g/cm3. The accepted value
is 2.70 g/cm3. What is the percent differ-
ence between her result and the accepted
value?
Did she do a good job?
99.
100. Percentage Problems
A student did three experiments to determine
the density of rubbing alcohol. Her results
were: 0.778 g/mL; 0.795 g/mL; 0.789 g/mL.
What is her precision as % of average?
The true value is 0.785 g/mL. What is her
accuracy?