Chapter 2 - Chapter 2 Lavoisiers conservation of mass -...

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Chapter 2 Ÿ Lavoisier’s conservation of mass - mass in neither created nor destroyed Ÿ Joseph Proust - a given compound always contains exactly the same proportion of elements by mass Ÿ Dalton’s law of multiple proportions - when two elements form a series of compounds, the ratios of the masses of the second element that combine with 1 gram of the first element can always be reduced to small whole numbers. Dalton’s Atomic Theory 1. Each element is made up of tiny particles called atoms. 2. The atoms of a given element are identical; the atoms of different elements are different in some fundamental way or ways 3. Chemical compounds are formed when atoms combine with each other. A given compound always has the same relative numbers and types of atoms 4. Chemical reactions involve reorganization of the atoms-changes in the way they are bound together. The atoms themselves are not changed in a chemical reaction. Ÿ Avogadro’s hypothesis - at the same temperature and pressure, equal volumes of different gases contain the same number of particles. Ÿ The nucleus is assumed to contain protons , which have a positive charge (+1) and neutrons
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This note was uploaded on 08/26/2011 for the course CHEM 1A 05611 taught by Professor Anderson during the Spring '09 term at UCSB.

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Chapter 2 - Chapter 2 Lavoisiers conservation of mass -...

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