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Unformatted text preview: Version 497 Final rev2 laude (51635) 1 This print-out should have 60 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 5.0 points When the reaction 3 NO(g) N 2 O(g) + NO 2 (g) is proceeding under conditions such that 0.015 mol/L of N 2 O is being formed each second, the rate of the overall reaction is ? and the rate of change for NO is ? . 1. 0.015 M s- 1 ;- 0.045 M s- 1 correct 2. 0.015 M s- 1 ;- 0.005 M s- 1 3. none of the other answers is correct 4. 0.015 M s- 1 ; +0.045 M s- 1 5. 0.030 M s- 1 ;- 0.005 M s- 1 Explanation: Notice that three moles of NO are required to make one mole of N 2 O in this reaction, so the rate of disappearance of NO (which has a negative sign) is three times the rate of appearance of N 2 O. 002 5.0 points The alkali metals all react with water. Which is the MOST reactive metal? 1. Rb 2. Li 3. K 4. Na 5. Cs correct Explanation: 003 5.0 points What is the pH of a solution containing 10- 9 M HClO 4 ? 1. 8.768 2. 9.000 3. 5.000 4. 5.232 5. 6.996 correct Explanation: 004 5.0 points Consider the reaction, A( aq ) + B( aq ) C( aq ) The equilibrium constant, K , is 2. If the concentrations of A, B and C are 2 M, 2 M and 10 M, respectively, which of the following would occur? 1. the reaction would move right 2. not enough information 3. nothing would occur 4. the reaction would move left correct Explanation: Q = [C] [A] [B] = 10 2 2 = 2 . 5 Since Q > K , the reaction would move right. 005 5.0 points Consider an aqueous solution of CaCl 2 and the following statements: Z1) Hydration is a special case of solvation in which the solvent is water. Z2) The oxygen ends of water molecules are attracted toward Ca 2+ ions. Z3) The hydrogen ends of water molecules are attracted toward Cl- ions. Which response contains all of the state- ments that are true and no false statements? 1. Z1 2. Z1, Z2, and Z3 correct Version 497 Final rev2 laude (51635) 2 3. Z1 and Z2 4. Z3 5. Z2 Explanation: O - H + H + Z1 is true; hydration cannot happen with any other solvent than water. Z2 and Z3 are also true since oxygen ( - ) will be attracted to the positive Ca + and the hydrogen ( +) will be attracted to the negative Cl- ions. 006 5.0 points What metal (in various oxidation states) is present at both the cathode and the anode in a typical car battery? 1. lead correct 2. zinc 3. nickel 4. cadmium 5. iron 6. copper Explanation: A car battery is also known as a lead storage battery. 007 5.0 points What is the average current generated in the Cu(s) | Cu 2+ (aq) || Fe 3+ (aq) | Fe(s) electrochemical cell if 50 g of Cu(s) are used up in a 24 hour period?...
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- Spring '07