Practic Exam 1 key par

Practic Exam 1 key par - Chemistry 105 B Practice Exam 1 Dr...

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Chemistry 105 B PLEASE PRINT YOUR NAME IN BLOCK LETTERS Practice Exam 1 Name: __________________________________________ Last 4 Digits of USC ID:_____ _____ _____ _____ Dr. Jessica Parr Lab TA’s Name: _________________________________ Lab: Tu 9 / Tu 1 / Tu 4 / W 1 / W 4 / F 1 Please circle lab section above . Question Points Score Grader 1 14 2 10 3 10 4 10 5 10 6 16 7 15 8 15 Total 100 First Letter of last Name
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1. (14 pts) For each of the following multiple choice questions, circle the letter for the most correct answer. (i) A reaction A B can go in both the forward and reverse directions. Which of the following statements is true when the reaction reaches equilibrium? (a) The forward and reverse rate constants are equal to each other. (b) The concentrations of A and B are equal to each other. (c) The rates of the forward and reverse reactions are equal to each other. (d) None of the above. (ii) The reaction A + 2 B Æ C occurs only in the forward direction. Which of the following does not affect the rate of this reaction? (a) The amount of A present. (b) The temperature. (c) The amount of C present. (d) The presence of a catalyst. (iii) An elementary step in a reaction mechanism involves the reaction NO + O Æ NO 2 . The rate of this elementary step: (a) is proportional to [NO] X [O]. (b) should not change when the temperature is increased. (c) depends on the concentration of NO 2 . (d) cannot be determined from the stoichiometry. (iv)
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This note was uploaded on 02/27/2008 for the course CHEM 105BL taught by Professor Warshel during the Fall '07 term at USC.

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Practic Exam 1 key par - Chemistry 105 B Practice Exam 1 Dr...

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