Chapter+2-1 - 1 Atomic Theory of Matter Aristotle...

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1 Atomic Theory of Matter Aristotle- infinitely divisible Democritus- indivisible particles (atoms) Dalton 1. Elements composed of atoms 2. All atoms of an element are identical 3. Atoms not changed by chemical reaction 4. Compounds are formed by combining or rearranging atoms of different elements 2 Observations That Led To An Atomic View Of Matter Law of Conservation of Mass- Lavoisier Law of Definite Composition- Proust Law of Multiple Proportions- Dalton 3 Law of Definite Composition Percent by Mass CO 2 contains 12.0 g of C and 32.0 g of O in 44.0 g %C = (12.0/44.0)( 100) = 27.3 %O = (32.0/44.0 )(100) = 72.7 In San Marcos or in London or Rome
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4 Law of Multiple Proportions Mass of oxygen combined with 12.0g carbon: CO 2 = 32.0 g CO = 16.0 g 32.0/16.0 = 2/1 which is a ratio of small whole numbers 5 J J Thomson - Cathode Rays and Electrons Robert Millikan - Oil-drop experiment Henri Becquerel - Radioactivity Marie Curie - Isolated products of radioactivity Ernest Rutherford - α , β , γ radiation and gold- foil experiment Atomic Structure 6 Rutherford’s Gold Foil Scattering Experiment
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7 Subatomic Particles •Nuc leus – Protons 1.0073 amu +charge
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Chapter+2-1 - 1 Atomic Theory of Matter Aristotle...

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