e1_132_f09 - Exam 1, CHE 132 Fall 2009 Multiple Choice, 5...

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Exam 1, CHE 132 Fall 2009 Multiple Choice, 5 points each On the Scantron form, bubble in the letter of the one choice that best completes the statement or answers the question. No credit will be given for multiple answers. ____ 1. Energy is added in the form of heat to a gas in a container with one displaceable wall. During the process the temperature of the gas increases 20 °C. As the temperature of the system increases, its volume increases until it is doubled. Which one of the following statements is correct ? A. w < 0 B. q = 0 C. w > 0 D. ΔH = w E. w = 0 ____ 2. What are the units of the rate constant for a reaction whose rate law is first order with respect to reactant A and second order with respect to reactant B? A. L mol –1 s –1 B. L mol –1 s C. L 2 mol –2 s –1 D. L 2 mol –1 s –2 E. L –1/2 mol 1/2 s –1 ____ 3. Consider the hypothetical reaction A + 2 B 3 C + D The rate of reaction is _____ times [B]/ t and _____ times [C]/ t. A. –2; –3 B. –1/3; 1/2 C. 1/2; –1/3 D. –1/2; –1/3 E. –1/2; 1/3
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____ 4. Suppose that a catalyst lowers the activation energy of a reaction from 125 kJ mol –1 to 55 kJ mol –1 . By what factor would you expect the reaction rate of the catalyzed reaction to increase at 25 °C? Assume that the frequency factors for the catalyzed and uncatalyzed are identical. A. 2.3 B. 1.9 × 10 12 C. 1.0 D. 1.9 × 10 146 E. 1.9 × 10 6 ____ 5. Calculate the enthalpy change at 25 °C and 1 bar for the production of 1.3 moles of CO(g) from C(graphite) and CO 2 (g). H f °(CO 2 ,g) = –393.509 kJ mol –1 H f °(CO,g) = –110.525 kJ mol –1 A. +83.3 kJ B. +3138 kJ C. +224 kJ D. +368 kJ E. +112 kJ ____ 6. The reaction of peroxidisulphate ion (S 2 O 8 2– ) with iodide ion (I ) is S 2 O 8 2– (aq) + 3 I (aq) 2 SO 4 2– (aq) + I 3– (aq) From the following initial data collected at 298 K determine the rate law for the reaction. Experiment
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This note was uploaded on 03/06/2012 for the course CHE 132 taught by Professor Hanson during the Fall '08 term at SUNY Stony Brook.

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e1_132_f09 - Exam 1, CHE 132 Fall 2009 Multiple Choice, 5...

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