chm 2046 exam 3 key

chm 2046 exam 3 key - CHM 2046 EXAM 3 FORM CODE A...

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CHM 2046 EXAM 3 FORM CODE A 04/10/2008 R = 8.3145 J/mol∙K 1. Which best defines a voltaic cell? A. A device in which electrons flow from cathode to anode. B. A device in which electrical energy is converted to chemical energy in order to do work. C. A device in which oxidation occurs at the cathode. D. A device that facilitates transfer of electrons from a reducing agent to an oxidizing agent. E. A device that drives a non-spontaneous reaction to become spontaneous. 2. Which of the following statements is TRUE about the entropy of a substance? A. Its units are J/K B. It increases with increasing disorder in the substance. C. It increases with increasing temperature. D. All of the above. E. None of the above. 3. What is the value of S° of pure crystalline CaF 2 at 0 K? A. -100 J/mol∙K B. -200 J/mol∙K C. 0 J/mol∙K D. 200 J/mol∙K E. 100 J/mol∙K 4. Which of the following statements is TRUE about this reaction: 3NO 2 ( g ) + H 2 O ( l ) 2HNO 3 ( l ) + NO ( g ) A. ΔS rxn is positive. B. Δ S rxn is negative. C. ΔS rxn is zero. D. ΔS rxn is infinite. E. None of the above. 5. Which of the statements below is TRUE concerning this voltaic cell: Al( s )│Al 3+ ( aq )║Cr 3+ ( aq ) │Cr( s ) A. Electrons travel from the chromium electrode to the aluminum electrode. B. Oxidation occurs at the chromium electrode. C.
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This note was uploaded on 04/24/2008 for the course CHM 2046 taught by Professor Veige/martin during the Spring '07 term at University of Florida.

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chm 2046 exam 3 key - CHM 2046 EXAM 3 FORM CODE A...

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