Exam 1 Practice Test Problems with Key

Which of the following is false a if we know that a

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13) Which of the following is false? A) If we know that a reaction is an elementary reaction, then we know its rate law. B) The rate-determining step of a reaction is the slowest elementary step of its mechanism. C) The chemical equations for the elementary reactions in a multistep mechanism must always add to give the chemical equation of the overall process. D) In a reaction mechanism, an intermediate is identical to an activated complex. E) All of the above statements are true. 14) For the elementary reaction NO 3 CO NO 2 CO 2 the molecularity of the reaction is __________, and the rate law is rate __________.
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15) A catalyst can increase the rate of a reaction __________. 16) The rate law of the overall reaction A B C is rate k[A] 2 . Which of the following will not increase the rate of the reaction? 17) At equilibrium, __________. A) all chemical reactions have ceased B) the rates of the forward and reverse reactions are equal C) the rate constants of the forward and reverse reactions are equal D) the value of the equilibrium constant is 1 E) the limiting reagent has been consumed 18) Which one of the following will change the value of an equilibrium constant? 19) The equilibrium-constant expression depends on the __________ of the reaction.
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  • Spring '13
  • Comstock
  • Reaction, Chemical reaction, Page Ref, NH

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