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# Martensen 3.1

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### Martensen 3.1

1. 1. What do you know about atoms?What do you know about atoms? • No books, no notes, no vocab.,No books, no notes, no vocab., complete the following:complete the following: (this is(this is not a test)not a test) – With the person next to youWith the person next to you make a list of everything youmake a list of everything you know about atoms.know about atoms. – Draw a model of an atom.Draw a model of an atom.
2. 2. Lets see your work...Lets see your work... On the big screen!On the big screen!
3. 3. Substances are madeSubstances are made of ATOMSof ATOMS 3.13.1 S. Martensen
4. 4. Atomic TheoryAtomic Theory • Atoms are the building blocks ofAtoms are the building blocks of all matter.all matter. • 2000 years after this was2000 years after this was proposed we have evidence toproposed we have evidence to support the idea but no one hassupport the idea but no one has seen an atom.seen an atom.
5. 5. Atomic ModelAtomic Model • Old IdeaOld Idea • New IdeaNew Idea See page 74 figures 1a and 1b
6. 6. Law of DefiniteLaw of Definite ProportionsProportions • Any sample of the same compoundAny sample of the same compound has thehas the same elementssame elements in thein the samesame proportionsproportions by mass.by mass. • Example: NaCl (table salt)Example: NaCl (table salt) – It is always 39.34% Na and 60.66% Cl by mass.It is always 39.34% Na and 60.66% Cl by mass. – 1g of salt is 39.34% Na and 60.66% Cl.1g of salt is 39.34% Na and 60.66% Cl. – 2000kg of salt is 39.34% Na and 60.66% Cl.2000kg of salt is 39.34% Na and 60.66% Cl.
7. 7. Law of Conservation ofLaw of Conservation of MassMass • In a chemical reaction, the massIn a chemical reaction, the mass of the reactants = the mass of theof the reactants = the mass of the products.products. See figure 3 page 76
8. 8. DaltonDalton • Elements: One type of atomElements: One type of atom • Compounds: 2 or more types of atomsCompounds: 2 or more types of atoms • This was in 1808 and he was right!This was in 1808 and he was right!
9. 9. Dalton’s 5 Principles of Atomic TheoryDalton’s 5 Principles of Atomic Theory 1.1. All matter is composed of atoms.All matter is composed of atoms. 2.2. Atoms of an element are identical.Atoms of an element are identical. 3.3. Atoms of different elements differ physicallyAtoms of different elements differ physically and chemically.and chemically. 4.4. Atoms of different elements combine in wholeAtoms of different elements combine in whole number ratios to form compounds.number ratios to form compounds. 5.5. In a chemical reaction, atoms are combined,In a chemical reaction, atoms are combined, rearranged, separated but NEVER created orrearranged, separated but NEVER created or destroyed.destroyed.
10. 10. #4 of Dalton’s Principles#4 of Dalton’s Principles • HH22O means: 2 atoms of hydrogen and 1 atomO means: 2 atoms of hydrogen and 1 atom of oxygen combine to make 1 molecule ofof oxygen combine to make 1 molecule of water.water. The ratio is 2:1.The ratio is 2:1. • FeOFeO22: 1 atom of iron and 2 atoms of oxygen: 1 atom of iron and 2 atoms of oxygen combine to form 1 molecule of iron oxidecombine to form 1 molecule of iron oxide (rust).(rust). The ratio is 1:2The ratio is 1:2 • NOTICE!!! There are no ½ or .5, etc… OnlyNOTICE!!! There are no ½ or .5, etc… Only whole number ratios.whole number ratios.
11. 11. Practice:Practice: • List the elements and ratios for the compounds listedList the elements and ratios for the compounds listed below. Do not try to name the compound.below. Do not try to name the compound. 1)1) CC66HH12120066 2)2) NHNH33 3)3) AlClAlCl33 4)4) HH22OO22 5)5) CC88HH1818 There is a periodic table in the back cover of your textbook.
12. 12. While I have your attention...While I have your attention... Lets take a look at some of theLets take a look at some of the problems you were having onproblems you were having on ChemThink.ChemThink.
13. 13. I took these screenshotsI took these screenshots while you were working onwhile you were working on the “quiz” for the Particlethe “quiz” for the Particle Nature of Matter.Nature of Matter.