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Unformatted text preview: Version 500 Final Exam VANDEN BOUT (53585) 1 This printout should have 60 questions. Multiplechoice questions may continue on the next column or page find all choices before answering. The Final has 60 questions. Use your time wisely and efficiently. 001 10.0 points The following data were obtained in four sep arate experiments measuring the initial rates of the reaction A + 2 B + C products with different concentrations of reactants. Initial Initial Initial Initial Trial [A] [B] [C] rate M M M M/s 10 2 10 2 10 3 10 8 1 1 . 5 2 . 1 . 2 4 . 2 3 . 2 . 1 . 2 8 . 3 3 . 2 . 2 . 4 8 . 4 1 . 5 3 . 3 . 6 9 . What are the exponents of [A], [B], and [C] (in that order) in the rate law? 1. 1; 1; 0 2. 1; 2; 1 3. 1; 0; 2 4. 1; 1; 1 5. 2; 1; 0 6. 2; 0; 1 7. 1; 2; 0 correct Explanation: Rate = k [A] x [B] y [C] z Rate 2 Rate 1 = k [A] x 2 [B] y 2 [C] z 2 k [A] x 1 [B] y 1 [C] z 1 8 4 = parenleftbigg 3 . 1 . 5 parenrightbigg x parenleftbigg 2 . 2 . parenrightbigg y parenleftbigg 1 . 2 1 . 2 parenrightbigg z 2 1 = 2 x x = 1 Rate 3 Rate 2 = k [A] 1 3 [B] y 3 [C] z 3 k [A] 1 2 [B] y 2 [C] z 2 8 . 8 . = parenleftbigg 3 . 3 . parenrightbigg parenleftbigg 2 . 2 . parenrightbigg y parenleftbigg 2 . 4 1 . 2 parenrightbigg z 1 = 2 = 2 z z = 0 Rate 4 Rate 1 = k [A] 1 4 [B] y 4 [C] 4 k [A] 1 1 [B] y 1 [C] 1 9 . 4 . = parenleftbigg 1 . 5 1 . 5 parenrightbigg parenleftbigg 3 . 2 . parenrightbigg y 2 . 25 = 1 . 5 y ln 2 . 25 = y ln 1 . 5 y = ln 2 . 25 ln 1 . 5 = 2 002 10.0 points Given the reaction N 2 (g) + 3 H 2 (g) 2 NH 3 (g) , what is the correct expression for K c ? 1. [N 2 ] [H 2 ] 3 [NH 3 ] 2 2. [NH 3 ] [N 2 ] [H 2 ] 3. [N 2 ] [H 2 ] 3 4. [NH 3 ] 2 5. [NH 3 ] 2 [N 2 ] [H 2 ] 3 correct Explanation: 003 10.0 points In a sample of pure water, only one of the Version 500 Final Exam VANDEN BOUT (53585) 2 following statements is always true at all con ditions of temperature and pressure. Which one is always true? 1. pOH = 7.0 2. pH = 7.0 3. [H 3 O + ] = [OH ] correct 4. [OH ] = 1 . 10 7 M 5. [H 3 O + ] = 1 . 10 7 M Explanation: The value of K w = [H 3 O][OH ] changes with temperature. In a neutral solution [H 3 O + ] always equals [OH ]. Only when K w = 1 . 10 14 will pH and pOH equal 7.0 and [H 3 O + ] and [OH ] equal 1 . 10 7 M . 004 10.0 points The production of nitric acid from ammonia and oxygen is the 1. arc process. 2. Hall process. 3. Haber process. 4. Ostwald process. correct Explanation: 005 10.0 points For the reaction cyclopropane(g) propene(g) at 500 C, a plot of ln[cyclopropane] vs t gives a straight line with a slope of . 00067 s 1 ....
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This note was uploaded on 06/18/2008 for the course CH 302 taught by Professor Holcombe during the Spring '07 term at University of Texas.
 Spring '07
 Holcombe
 Chemistry

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