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CHEM151Take-home Q3 Key

Chemistry (MasteringChemistry Series)

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Take Home Quiz #3 (DUE Friday September 19 th , 2008) Name Date Score 1) Define the Law of Conservation of Mass. Cannot create nor destroy matter 2) Define the Law of Multiple Proportions. Two or more elements can combine to form more than one compound in a specific ratio 3) Define the Law of Definite Proportions. Elements combine in specific ratios 4) The Cathode Ray Tube was used to discover ___ Electrons __. 5) The Oil Drop Experiment by Millikan was used to find __ The charge of an electron (1.6 x 10 19 C) _. 6) Define the following. a. Isotope Atoms of the same element, but differ in number of neutrons b. Ion Atom with different number of protons and electrons (i.e. short an electron has an oxidation or charge of +1) 7) How many electrons, protons, and neutrons are in the following isotopes? a. 24 Mg 12 protons, 12 electrons, neutrons = 24 – 12 = 12 b. 66 Zn 30 protons, 30 electrons, neutrons = 66 – 30 = 36 c. 235 U 92 protons, 92 electrons, neutrons = 235 – 92 = 143 d. 32 S 16 protons, 16 electrons, neutrons = 32 – 16 = 16
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