201_Chapter2_lectures_1_2

201_Chapter2_lectures_1_2 - Chapter 2 Atoms, Molecules and...

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Dalton’s Atomic Theory of Matter 1. Elements are composed of extremely small particles called atoms . 2. All atoms of a given element are identical, having the same size, mass and chemical properties. The atoms of one element are different from the atoms of all other elements. 1. Compounds are composed of atoms of more than one element. ― Supporting the law of definite proportions and the law of multiple proportions. 2. A chemical reaction involves only the separation, combination, or rearrangement of atoms; it does not result in their creation or destruction. ― Law of conservation of mass. Chapter 2 Atoms, Molecules and Ions
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J.J. Thomson, measured mass/charge ratio of e - (1906 Nobel Prize in Physics) Discovery of the Electron ― Cathode Ray Tube Determined e - charge = -1.6022 x 10 -19 C Thomson’s charge/mass of e - = -1.76 x 10 8 C/g Measured e - mass = 9.10 x 10 -28 g (1923 Nobel Prize in Physics) Millikan’s Oil Drop Experiment 1909 Rutherford’s Experiment to Discover the Atomic Nucleus
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This note was uploaded on 02/10/2011 for the course CHEM 201 taught by Professor Griffen during the Fall '09 term at Bunker Hill.

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201_Chapter2_lectures_1_2 - Chapter 2 Atoms, Molecules and...

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