Handout0903 - Chem 100 Monday September 3 2007 Handout...

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Unformatted text preview: Chem 100, Monday September 3, 2007 Handout Syllabus, Clickers John Dalton’s Atomic Theory: 1. All matter is composed of indivisible atoms of finite mass and size. 2. There are ≈ 100 elements (atom types). All atoms of an element are identical. 3. Atoms are forever (are not created or destroyed, and do not change types) 4. Chemical compounds are combinations of atoms of different elements in specific small integer ratios. 5. Mass of any object (substance, molecule) is the sum of masses of its atoms. Hydrogen Compound Water Peroxide Limestone Elements H, O H, O Ca, C, O Mass Ratio (Proust) 1 : 7.94 1 : 15.88 1 : 4.00 : 3.33 Atom Ratio (Dalton) 2 : 1 1 : 1 1 : 1 : 3 Chemical Formula H 2 O H 2 O 2 CaCO 3 Law of Definite Proportions (Proust) Law of Multiple Proportions (Dalton) Law of Conservation of Mass (Lavoisier) Substances, Mixtures, Elements, Compounds Sample problems: 2.21 Zinc Sulfide (ZnS) occurs in zincblende and wurtzite crystal structures. (a) If 2.54 g of ZnS contains 1.70 2....
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