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178Exam1KeyS07

# 178Exam1KeyS07 - DR JESUDOSS KINGSTON DR JOE BURNETT SPRING...

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DR. JESUDOSS KINGSTON DR. JOE BURNETT SPRING 2007 THIS EXAM CONSISTS OF 14 QUESTIONS ON 10 PAGES CHEM 178 HOUR EXAM I February 7, 2007 NAME______________________ RECIT. INSTR.______________ RECIT. SECT._______________ GRADING Teaching Assistants and Recitation Sections PAGE POINTS SCORE Name Sections Time 2 3 4 5 6 7 8 9 TOTAL 12 pts 14 pts 18 pts 16 pts 16 pts 12 pts 12 pts 2 pts 102 pts ________ ________ ________ ________ ________ ________ ________ ________ David Ackerman Wei Huang Andrew Lantz Michael Murphy Sean Nedd Beth Prince Rafael Lopes Quirino Suzanne Sander Yongchao Su Aaron West 1, 11 4, 20 14, 15 5, 8 6, 13 3, 12 10, 16 7, 17 2, 9 18, 19 8:00, 9:00 10:00, 9:00 11:00, 12:10 11:00, 12:10 11:00, 10:00 9:00, 10:00 2:10, 12:10 12:10, 1:10 9:00, 1:10 2:10, 3:10 QUESTIONS ARE WRITTEN ON BOTH SIDES OF EACH PAGE. THERE IS A PERIODIC TABLE, EQUATIONS, AND CONSTANTS ON THE LAST PAGE. YOU MAY REMOVE THIS PAGE FOR SCRATCH PAPER. THE ANSWER KEY TO THIS EXAM WILL BE POSTED ON BULLETIN BOARD #6 IN THE HALLWAY EAST OF ROOM 1002 GILMAN AND ON THE CHEM 178 WEBSITE. SHOW ALL WORK. ANSWERS SHOULD INCLUDE APPROPRIATE UNITS AND CONTAIN THE CORRECT NUMBER OF SIGNIFICANT FIGURES. Answer Key

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2 1. (4 pts) If the rate law for a reaction is rate = k [A][B] 2 . Which one of the following statements is NOT correct? a) The reaction is first order in A. b) The reaction is second order in B. c) The reaction is second order overall. d) If [B] is doubled, the reaction rate will increase by a factor of 4. e) If [A] is doubled, the reaction rate will also be doubled. 2. (4 pts) The overall reactions and rate laws for several reactions are given below. Which one of the following represents an elementary step? a) 2A ⎯⎯→ P rate = k[A] b) A + B ⎯⎯→ P rate = k[A][B] c) A + 2B ⎯⎯→ P rate = k[A] 2 d) A + B + C ⎯⎯→ P rate = k[A][C] e) A + 2B ⎯⎯→ P rate = k[A][B] 3. (4 pts) The rate law of the following overall reaction A + B ⎯→ C is measured to be rate = k [A] 2 . Which one of the following will NOT increase the rate of the reaction? a) increasing the concentration of reactant A b) increasing the concentration of reactant B c) increasing the temperature of the reaction d) adding a catalyst for the reaction e) All of these will increase the rate.
3 4. (10 pts) For the simple decomposition reaction A B (g) ⎯⎯→ A (g) + B (g) the rate = k [AB] 2 and k = 0.20 M –1 s –1 . How long will it take for [AB] to reach one-half of its initial concentration of 1.50 M? For full credit, show all work, use units, and report your answer to the correct number of significant figures. The time needed for the concentration to be cut in half is called the half life, t

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178Exam1KeyS07 - DR JESUDOSS KINGSTON DR JOE BURNETT SPRING...

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