Chem1201PReviewCh2

Chem1201PReviewCh2 - Chemistry 1201 Review/Preview Chapter...

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Chemistry 1201 Review/Preview Chapter Two Review Guide Dr. Saundra McGuire Spring 2007 Atoms, Molecules, and Ions I. Fundamental Laws of Chemistry (Know how to state these and illustrate their operation) A. Law of Conservation of Mass B. Law of Constant Composition C. Law of Multiple Proportions II. Experiments Relative to Atomic Structure and Atomic Particles (Know how to explain each experiment and what each demonstrated) A. The JJ Thomson cathode ray tube experiment B. The Milliken Oil Drop Experiment C. Rutherford’s Experiment III. Atomic Structure A. Atomic particles -- protons, neutrons, electrons (mass and charge relationships) See Table 2.1 in text. B. Isotopes: A A = mass number ( protons + neutrons) X X is the elemental symbol Z Z = atomic number (# of protons) Number of neutrons = A - Z NOTE: All atoms of an element have the same number of protons; only the number of neutrons can change (for different isotopes) or the number of electrons can change (in the case of an ion of the element). C. Calculating average atomic weight from weights of individual isotopes Av. At. Mass = (wt. of isotope 1) X (% of isotope 1) + (wt. of isotope 2) X (% of isotope 2) + . .. 100
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Chem1201PReviewCh2 - Chemistry 1201 Review/Preview Chapter...

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