Final Exam B_120A_Aut11 - key (1)

Final Exam B_120A_Aut11 - key (1) - Name: _ CHEM 120A,...

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Name: __________________________ CHEM 120A, Final Exam, Dec. 15, 2011 Page 2 of 13 1. Multiple choice (45 pts total, 3 pts each). Clearly mark your answer. Choose only one answer for each question. (1) In the sun, nuclei of hydrogen combine to form a larger nucleus and release a great amount of energy. The process is known as a. decomposition b. chain reaction c. ionization d. fission e. fusion (2) Which of the following is a product of decay of 238 92 U? a. 234 90 Th b. 238 93 Np c. 238 91 Pa d. 235 92 U e. 242 94 Pu (3) A chemical reaction has reached equilibrium when a. The catalyst has been used up. b. The concentration of reactants and products are equal. c. The rate of the forward reaction equals the rate of the reverse reaction. d. All the reactants have been converted to products. e. All products have been removed from the reaction mixture. (4) Which of the following is the weakest acid? a. HF (K a = 7.2 x 10 -4 ) b. HCN (K a = 4.9 x 10 -10 ) c. HCNO (K a = 2.0 x 10 -4 ) d. H 3 BO 3 (K a = 5.4 x 10 -10 ) e. HNO 2 (K a = 4.5 x 10 -4 )
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_________________________ Final Exam, CHEM 120A, Dec. 15, 2011 Page 3 of 13 (5) A sample of silicon has three naturally occurring isotopes; Si-28 (mass 28.0 amu); Si-29 (mass 29.0 amu) and Si-30 (mass 30.0 amu). Which isotope is the most abundant? a. Si-28 b. Si-29 c. Si-30 d. All isotopes have the same natural abundance (6) According to Boyle’s Law, the pressure of a gas increase as the volume decreases because a. The gas particles get bigger. b. The gas particles strike the walls of the container more often. c. The kinetic energy of the gas particles increases. d. The gas particles strike the walls of the container with more force. e. The temperature of the gas increases. (7) What is oxidized and what is reduced in the following reaction? 2Al(s) + 3Br 2 (g) 2AlBr 3 (s) a. AlBr 3 is reduced and Al is oxidized. b. AlBr 3 is oxidized and Al is reduced. c. AlBr 3 is reduced and Br 2 is oxidized. d. Al is reduced and Br 2 is oxidized. e. Al is oxidized and Br 2 is reduced. (8) The correct symbol for the isotope of potassium with 22 neutrons is a. 22
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Final Exam B_120A_Aut11 - key (1) - Name: _ CHEM 120A,...

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