Exam4_Spring06

Exam4_Spring06 - Chemistry 105 B Professors Krylov/...

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1 Chemistry 105 B Midterm 4 Professors Krylov/ Bradforth Spring 2007 YOU MUST SHOW YOUR COMPLETE WORKING ON EACH OF PROBLEMS 3-7 TO RECEIVE FULL CREDIT. STATE AND JUSTIFY ANY APPROXIMATIONS YOU MAKE. Useful Physical Constants and Equations G=H - TS G= G º + RT ln(Q) G º = -RT ln(K) G = -nFE, I=qt Spectrochemical series: CN - > NO 2 - > en > NH 3 > H 2 O > OH - > F - > Cl - > Br - > I - Important constants and conversion factors: F=96,485 C/mol R=8.314 J m -1 K -1 N a =6.02x10 23 ) ln( 0 Q nF RT E E = ) log( 0592 . 0 0 Q n E E =
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3 1. Multiple choice (9 points). Circle the correct answer. (a) In the methanol fuel cell, the compound being reduced is: (i) H 2 (ii) CO (iii) CH 4 (iv) CH 3 OH (v) O 2 (b) Which of the following reactions is involved in a typical automobile battery? (i) Zn + HgO + H 2 O = Zn(OH) 2 + Hg (ii) Pb + PbO 2 + 2SO 4 2- + 4H 3 O + = 2 PbSO 4 + 6 H 2 O (iii) Cd + NiO(OH) + 2H 2 O = Cd(OH) 2 + 2Ni(OH) 2 (iv) Pb + 2OH - = Pb(OH) 2 (v) 2CH 3 OH + 3O 2 = 2CO 2 + 4H 2 O (vi) none of the above (c) What happens in a hydrogen/oxygen fuel cell? (i) H 2 and O 2 are combined directly to produce H 2 O, and the energy released is used to produce electricity. (ii) H 2 and O 2 are first converted to their liquid state, and then combined directly to give H 2 O. (iii) H
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This note was uploaded on 04/25/2008 for the course CHEM 105BL taught by Professor Warshel during the Spring '07 term at USC.

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Exam4_Spring06 - Chemistry 105 B Professors Krylov/...

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