Chem Chap 2 - Chapter 2 Dalton's Laws 1. 2. 3. 4. All...

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Chapter 2 Dalton’s Laws 1. All matter is made of atoms. 2. All atoms of the same elements are the same. 3. Compounds are whole # combinations of different atoms. 4. In a chemical reaction atoms are reorganized but never made of destroyed. Experimental Observations I. Law of conservation of mass- Matter is never created or destroyed; its conserved, chemical equations must have all atoms balanced to keep the weight equal. Ex. 180g glucose + 192g oxygen gas 264g carbon dioxide + 108g water 372g material before change 372g material after change II. Law of constant composition- A compound will have the same definite elemental composition by weight. Composition is defined by mass fraction (part of the compound’s mass by element) and expressed by mass percent (the fraction by mass in percent). Ex. 20.0g Calcium Carbonate Mass fraction Mass percent 8.0g Calcium 0.40 Calcium 40% 2.4g Carbon 0.12 Carbon 12% 9.6g Oxygen 0.48 Oxygen 48% Mass fraction- Obtained by elemental mass divided by the whole (8.0g Calcium
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Chem Chap 2 - Chapter 2 Dalton's Laws 1. 2. 3. 4. All...

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