Ch16_ModelQuestion

Ch16_ModelQuestion - Chapter 16: Model Questions 1) If 2A +...

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Chapter 16: Model Questions 1) If 2A + B --> C is a one–step reaction, the rate expression is (A) rate = k[C] (B) rate = k[A] 2 (C) rate = k[A] [B] (D) rate = k[A] 2 [B] 2) A reaction mechanism has several steps. The rate of the overall reaction is equal to (A) the rate of the fastest step. (B) the rate of the slowest step. (C) the average of the rates of the steps. (D) the difference between the rate of the fastest step and the rate of the slowest step. 3) Generally an increase of ten degrees Celsius doubles the rate of reaction between gases. What is the explanation for this increase in reaction rate? (A) The pressure is doubled. (B) The concentration of the reactants is doubled. (C) The average kinetic energy of the molecules is doubled. (D) The number of intermolecuiar collisions per unit of time is doubled. (E) The number of particles with an energy above a minimum activation energy is doubled. 4) X and Y react together. For a three-fold increase in the concentration of X there is a nine-fold increase in the rate of the reaction. This shows that the order with respect to X is a) 0 b) 1 c) 2 d) 3 5) Which statement is incorrect about a 2-step reaction? a) Either step may be rate determining. b) There are two transition states. c) There are two intermediates. d) The reaction may be exothermic or endothermic.
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6) For a reaction: A + B C the rate equation is: Rate of reaction = k [A], Which statement is incorrect ? a) The units of the rate constant are s –1 . b) A plot of [A] against time is linear. c) The rate is independent of the concentration of B. d) The rate is independent of the concentration of A. 7) For the reaction: 2A + B C which statement is correct ? a) The rate of disappearance of B is twice that of A. b) The rate of disappearance of A is twice that of B. c) The rate of appearance of C equals to the sum of the rates of the disappearance of A
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This note was uploaded on 02/18/2012 for the course CHEM 6C taught by Professor Hoeger during the Spring '08 term at UCSD.

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Ch16_ModelQuestion - Chapter 16: Model Questions 1) If 2A +...

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