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Unformatted text preview: Chemistry 2A Chemistry 2A-c w2009 (Ch2 c w2009 (Ch2-1) 1) Atoms and Atomic Theory Atoms and Atomic Theory I. Early experimental observations: Conservation of mass : total mass of reactants = total mass of products e.g. 2H 2 + O 2 2H 2 O Law of constant proportion : A compound have the definite proportions by mass of the constituent elements: e.g. H 2 O Daltons Atomic Model: 1. Each chemical element is composed of indestructible minute particles called ATOMS ATOMS : Atoms can be neither destroyed or created during a chemical reaction. 2. All atoms of the same element element have the same mass and properties, but the atoms of one element are different from those of other elements in mass and properties. 3. Compounds: consist of atoms in definite proportions definite proportions . Chemistry 2A Chemistry 2A-c w2009 c w2009 (Ch2 (Ch2-2) 2) II. Discoveries of electrons and radioactivities J.J. Thomson: Cathode-ray tube experiment (1897) Electron charge to electron mass ratio:...
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- Winter '09