3 exam - Chem 141 Exam 3 - November 9, 2007 Name:_ Multiple...

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Chem 141 Exam 3 - November 9, 2007 Name:_______________________________ Multiple choice: Choose the best answer. (2 points each) __ C _ 1. In the reaction, 2 NO 2(g) + F 2(g) 2 NOF (g) rate = - ! [F 2 ]/ ! t The rate of the reaction may also be expressed as: a) 1/2 Δ [NO 2 ]/ Δ t d) - 2 Δ [NO 2 ]/ Δ t b) - Δ [NOF]/ Δ t e) - Δ [NO 2 ]/ Δ t c) 1/2 Δ [NOF]/ Δ t __ C _ 2. If the reaction rate increases by a factor of 64 when the reactant concentration increases by a factor of 4, the order of the reaction with respect to that reagent is: a) 1 d) 4 b) 2 e) 8 c) 3 __ D _ 3. Which of the following statements is not accurate about rate constants, k? a) its value is independent of reactant concentration b) its value generally increase with temperature c) it always includes units of time d) it has the same value for all reactions at a given temperature e) it must be determined experimentally __ A _ 4. The reaction of NO 2 and F 2 is described by the following equation: 2 NO 2(g) + F 2(g) 2 NO 2 F (g) Experiments reveal that rate = k [NO 2 ] [F 2 ]. Which of the following is true? a) The reaction must occur in more than one step. b) The reaction is unimolecular. c) The reaction order is 3. d) The reaction order with respect to NO 2 is 2. e) Rate data only tells us how fast a reaction goes. __ B _ 5. Which of the following molecules is soluble in a non-polar solvent? a) HCl b) CS 2 c) SO 3 d) NH 3 e) NaCl __ C _ 6. For the reaction below, K eq = 54. H 2(g) + I 2(s) 2 HI (g) A mixture of H 2 , I 2 and HI, each at 0.020 M, was added. Which of the following is true? a) at equilibrium, [HI] = 0.010 M
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3 exam - Chem 141 Exam 3 - November 9, 2007 Name:_ Multiple...

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