Exam4_115b_2008-key

Exam4_115b_2008-key - Chemistry 115 B Professors...

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Chemistry 115 B Midterm 4 Professors Krylov/Reisler Spring 2008 Name (Last, First): TA ’ name: Questions Points Score Grader 1 10 2 6 3 5 4 12 5 22 6 15 7 15 8 15 Total 100 Please sign below: I certify that I have observed all the rules of Academic Integrity while taking this examination. Signature: _______________________________________ Instructions: 1. There are 8 questions. 2. You must show your work to receive credit. 3. If necessary, please continue your solutions on the back of the preceding page (facing you). 4. Please read each question carefully before writing your answer. 5. Exams written in pencil cannot be submitted for regarding.
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Useful Physical Constants and Equations T C = T K - 273.15 R = 8.314 J K -1 mol -1 F=96,485 C/mol k b =R/N a N a =6.02x10 23 Thermodynamics S univ   S sys   S surr S surr = - H /T G = H - T S G o reaction = n p G f o (products) - n r G f o (reactants) S o reaction = n p S o (products) - n r S o (reactants) G 0 = H° - T S° = - nFE ° G 0 = - RT ln K q p = n C p T Electrochemisty: Q RT G G ln 0 ln b k S 1 2 ln T T nc S v v 1 2 ln T T nc S p p 1 2 ln V V nR S qt I nF q nFE G ) ln( 0 Q nF RT E E ) log( 0592 . 0 0 Q n E E 0 0 0 ln rxn rxn rxn G H S K RT RT R     Q RT G G ln 0 ) ln( 0 K nF RT E
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1. Multiple choice (10 points). Circle the correct answer: A. Which of the following statements is not true: a) heat is not state function b) the entropy of the universe is constant for any equilibrium process. c) the absolute entropy of a substance increases with increasing temperature. d) a machine converting heat into work is never 100% efficient. e) all exothermic processes are spontaneous. B. For which process is S sys negative? a) evaporation of 1 mol of ethanol (l) b) mixing 5 mL ethanol with 25 mL water c) expanding 1 mol of nitrogen at constant temperature from 1.5 L to 2.0 L d) raising the temperature of 100 g Cu from 275 K to 295 K e) increasing the pressure of steam from 1 atm to 2 atm at constant temperature C. The driving force that produces voltage in a concentration cell is: 1. a) Temperature 2. b) Enthalpy 3. c ) Entropy 4. d) Standard cell potential 5. e) None of the above 6.
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Exam4_115b_2008-key - Chemistry 115 B Professors...

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