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3.1 What type of mixture (homogeneous or heterogeneous) is each of the following: a) air b) vinegar c) milk d) paint e) gatorade (the yummy blue kind!!) f) beer CHEM 101 Lecture 3 3:2 Lavoisier Famous Chemists Dalton Gay-Lussac Avogadro CHEM 101 Lecture 3 3:3 Law of Multiple Proportions: When two elements form more than one compound, the masses of one element in these compounds for a fixed mass of the other element are in ratios of small whole numbers. Are you as smart as Dalton? Data: Compound A Compound B Amount N 1.206 g 1.651 g Amount O 2.755 g 4.714 g What is the ratio of oxygen in the two compounds for a fixed amount of nitrogen? Bonus question: Give possibilities for the compounds. CHEM 101 Lecture 3 3:4 Dalton’s Atomic Theory (in his own words): Atomic Theory – An explanation of the structure of matter in terms of different combinations of very small particles. 1. All matter is composed of indivisible atoms. Am atom is an extremely small particle of matter that retains its identity during chemical reactions. 2. An element is a type of matter composed of only one kind of atom. 3. A compound is a type of matter composed of two or more elements chemically combined in fixed proportions. A chemical reaction consists off the rearrangement of atoms present in the reacting substances to give new chemical combinations present in the substances formed by the reaction. CHEM 101 Lecture 3