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Lecture 2 - Fri Sept 5 2003 Todays Lecture 2.1 Early...

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Fri. Sept. 5, 2003 Today’s Lecture 2.1 Early History of Chemistry 2.2 Fundamental Chemical Laws, etc…… 2.5 Characterizing the Atom
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Matter What is matter composed of ? Why do we believe these theories? What is the evidence?
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Atoms, Molecules, and Ions (Zumdahl, Chapter 2) History of Chemistry: – Democritus (460-370 BC): proposed the existence of atoms (atomos) as the smallest indivisible unit – Alchemists: discovered many elements believed in being able to change metals into gold. – Robert Boyle (1627-1691): First “Chemist” quantitative behavior of gases element cannot be broken down into 2 or more simpler substances
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Fundamental Chemical Laws: – Lavoisier (1743-1794): “mass is neither created nor destroyed” Law of Conservation of Mass – Proust (1754-1826): “a given compound always contains exactly the same proportion of elements by mass” Law of Definite Proportions – CO 2 always contain 2.66g of O for every g of C
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