Exam 1 Practice Test Problems with Key

A reaction was found to be third order in a

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4) A reaction was found to be third order in A. Increasing the concentration of A by a factor of 3 will cause the reaction rate to __________. A) remain constant B) increase by a factor of 27 C) increase by a factor of 9 D) triple E) decrease by a factor of the cube root of 3 The data in the table below were obtained for the reaction: 2 3 2 2 2ClO (aq) 2OH (aq) ClO (aq) ClO (aq) H O(l) 5) What is the magnitude of the rate constant for the reaction? 6) Which one of the following graphs shows the correct relationship between concentration and time for a reaction that is second order in [A]?
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7) The rate constant for a particular second-order reaction is 1 1 0.47 M s . If the initial concentration of reactant is 0.25 mol/L it takes __________ s for the concentration to decrease to 0.13 mol/L 8) A second-order reaction has a half-life of 18 s when the initial concentration of reactant is 0.71 M. The rate constant for this reaction is __________ 1 1 M s . A) 2 7.8 10 B) 2 3.8 10 C) 2 2.0 10 D) 1.3 E) 18 9) The isomerization of methylisonitrile to acetonitrile CH 3 NC(g) CH 3 CN(g) is first order in CH 3 NC . The rate constant for the reaction is 9.45 10 5 s 1 at 478 K. The half-life of the reaction when the initial [ CH 3 NC ] is 0.030 M is __________ s. 10) Under constant conditions, the half-life of a first-order reaction __________.
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11) As the temperature of a reaction is increased, the rate of the reaction increases because the __________. 12) Which energy difference in the energy profile below corresponds to the activation energy for the forward reaction? A) x B) y C) x y D) x y E) y x
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