ESSEX COUNTY COLLEGE CHM 104 BIO & CHEM DIVISION 5. For which of the following p

Question

ESSEX COUNTY COLLEGE CHM 104 BIO & CHEM DIVISION 5. For which of the following processes 8. Balance the following oxidation- would Arso be expected to be most reduction occurring in acidic solu- Mno. (aq) Co2 (aq) positive tion. 8H (aq) (a) Mnou (aq) 5Coa (aq) Mn2+ (aq) (b) NH3(g) +HCl(g) NH,Cl(s) 4H2O(aq) 5Coa (aq) (c) O2 (g) 2H2(g) 2H20 (g) 8H (aq) (b) Mno (aq) (d) N204 (g) 2NO2 (g) Co2+ (e) 2NH.NO (s) 2N2(g) O2 (g) 4H2O(g) 8H (aq) (d) Mnou (aq) 6. The free-energy change of a reaction is 2Coa (aq) a measure of 4H20(ac) 2 Cos (aq) (a) the excess entropy given off to the (e) Mnou (aq) Co +(aq) reaction system. (b) the increased molecular disorder that occurs in the system. 9. Which of the following statements con- (c) the energy given off to the sur- cerning a voltaic cell is/are correct? Reduction occurs at the cathode. A spontaneous reaction generates an (d) the direction in which a net reac- electric current in a voltaic cell. tion occurs. (e) the excess entropy given the Without a salt bridge charge buildup off to will cause the cell reaction to stop. (a) 1 only (b) 2 only 7. If a process is both endothermic and (c) 3 only spontaneous, then (d) 1 and 2 (a) AH (e) 1, 2, and 3 (b) AG 0. (c) AS 0. (d) AU 0. (e) AH 0 Page 2 of 8 Prof. A. Ermoline

Explanation / Answer

5) e, more number of gaseous products are formed.

6)d, free energy predict the spontainity of a reaction

7)c, entropy change should be negative

8)a

9)e,

10) b

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