CHexam1 - Version 329 Exam 1 vanden bout(51640 This...

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Version 329 – Exam 1 – vanden bout – (51640) 1 This print-out should have 31 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. 001 0.0 points The fgure represents a reaction at 298 K. b b b b b G A B C D E rxn progress Based on the fgure, which oF the Following statements (iF any) is False 1. none oF the statements are False correct 2. For this reaction Δ G is negative 3. at point C, the system is at equilibrium 4. at point D, the reaction will move towards the reactants to get to equilibrium 5. at point B, Q < K Explanation: Δ G is negative (point E is lower Free en- ergy than point A), K > 1 At point B, the reaction will move to the products (Q < K) At point E, the reaction will move to the re- actants (Q > K) At point C, the reaction is at equilibrium (Q = K) 002 0.0 points Consider the reaction: H 2 CO 3 (aq) ←→ H 2 O( ) + CO 2 (g) IF K = 2 . 7 and the concentrations oF H 2 CO 3 , H 2 O, and CO 2 are 5 . 88 M, 55 . 4 M, and 0 . 318 M, respectively, what will happen in order For the system to reach equilibrium? 1. the reaction will shiFt to the leFt 2. not enough inFormation 3. nothing will occur 4. the reaction will shiFt to the right correct Explanation: Q = [CO 2 ] [H 2 CO 3 ] = 0 . 318 5 . 88 = 0 . 054 Since Q is less than K, the reaction will shiFt to the right. 003 0.0 points The temperature dependence oF the equilib- rium constant is determined by 1. the standard enthalpy oF the reaction cor- rect 2. the standard Free energy oF the reaction 3. the equilibrium constant is independent oF temperature 4. the standard entropy oF the reaction Explanation: The temperature dependence oF the equi- librium constant is determined by Δ H . 004 0.0 points Which oF the Following is TRUE? 1. A large value oF K means that the equi- librium concentrations oF products are large compared to the equilibrium concentrations oF the reactants. correct 2. A small value oF K means that the equilib- rium concentrations oF the reactants are small compared to the equilibrium concentrations oF the products. 3. When the value oF K is small, the equi- librium lies on the product side oF the equilib- rium reaction. 4. When the value oF K is large, the equilib- rium lies on the reactant side oF the equilib-
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Version 329 – Exam 1 – vanden bout – (51640) 2 rium reaction. 5. When the value of Q is large, the equilib- rium lies on the product side of the equilib- rium reaction. Explanation: 005 0.0 points Rank these compound by vapor pressure from lowest to highest 1. CH 4 < C 3 H 8 < CH 3 OH < C 3 H 7 OH 2. CH 4 < CH 3 OH < C 3 H 8 < C 3 H 7 OH 3. CH 3 OH < C 3 H 7 OH < CH 4 < C 3 H 8 4. C 3 H 7 OH < C 3 H 8 < CH 3 OH < CH 4 5. C 3 H 7 OH < CH 3 OH < C 3 H 8 < CH 4 correct 6. C 3 H 8 < CH 4 < C 3 H 7 OH < CH 3 OH Explanation: The molecule with the strongest inter- molecular forces should have the lowest vapor pressures. The alcohols will all be lower than the alkanes due to the H-bonding. Within
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This note was uploaded on 05/02/2011 for the course CH 302 taught by Professor Holcombe during the Spring '07 term at University of Texas.

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CHexam1 - Version 329 Exam 1 vanden bout(51640 This...

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