2009 Exam 02 - CHE132S09Ex02 Multiple Choice Identify the...

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CHE132S09Ex02 Multiple Choice Identify the choice that best completes the statement or answers the question. There are 26 questions, each question counts 4 points, so one is a bonus question, and you can miss one and still score 100%. ____ 1. What is the correct expression for the rate of the smog-producing reaction below? 2NO(g) + O 2 (g) 2NO 2 (g) A) rate = [NO] 2 / t B) rate = – [NO] 2 / t C) rate = –  [NO] 2 [O 2 ])/ t D) rate = – [NO]/ t E) rate = [O 2 ]/ t Trial Initial [Br 2 ] (M) Initial [NO] (M) Initial Rate (M/s) 1 0.025 0.040 1.2 2 0.025 0.080 2.4 3 0.025 0.120 3.6 4 0.050 0.040 4.8 5 0.075 0.040 10.8 ____ 2. The rate data given in the table above were collected for the following reaction. What is the experimental rate law for this reaction? 2 NO(g) + Br 2 (g) 2NOBr(g) A) rate = k[NO][Br 2 ] B) rate = k[NO] C) rate = k[Br 2 ] D) rate = k[NO] 2 [Br 2 ] E) rate = k[NO][Br 2 ] 2 ____ 3. Which one of the following statements A-D correctly describes a reaction for which a plot of ln[reactant] vs time produces a straight line? If all are correct respond (E). A) The rate constant determines the value of the intercept on the vertical axis. B) The rate constant equals (–1) times the slope of the line. C) The rate of the reaction does not depend on the concentration of the reactant. D) The reaction is second order with respect to the reactant. E) All statements A-D are correct. ____ 4. The rate constant for the decay of a toxic chemical in ground water is 0.10/month. If the concentration of this chemical is 0.15 M, how long will it take for the concentration to fall to 0.0015 M? A) 23 months
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B) 46 months C) 69 months D) 13 months E) 6 months ____ 5. Brazil produces ethanol for use as a fuel from the sucrose in sugar cane. One step in this process involves the acid hydrolysis of the sucrose. The rate constant for this reaction is 2.12x10 –4 M –1 s –1 at 27 o C and 8.46x10 –4 M –1 s –1 at 37 o C. What is the activation energy for this reaction? A) Between 0 and 50 kJ/mol B) Between 50 and 100 kJ/mol C) Between 100 and 150 kJ/mol D) Between 150 and 200 kJ/mol E) Between 200 and 250 kJ/mol ____ 6. The activation energy for peptide bond hydrolysis in a protein is 57.5 kJ/mol at 25
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This note was uploaded on 04/23/2010 for the course CHE 132 taught by Professor Hanson during the Spring '08 term at SUNY Stony Brook.

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2009 Exam 02 - CHE132S09Ex02 Multiple Choice Identify the...

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