Exam-3-A-E - Fall 2010 CHEMISTRY 104 Section 001 Exam 3...

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Unformatted text preview: Fall 2010 CHEMISTRY 104 Section 001 Exam 3 Name: ______________________ ID: XXX-XX-_ ______ Seat #: ___ 1. When ignited, solid ammonium dichromate decomposes in a fiery display. This is the reaction for a "volcano" demonstration. The decomposition produces nitrogen gas, water vapor, and chromium(III) oxide. The temperature is constant at 25C. Substance H f (kJ/mol) S (kJ/mol K)-1140. 0.08116-242 0.1187 0.1915-22.5 0.1137 Determine S univ (in kJ/mol K). A) 7.63 B) 7.78 C) 84.1 D) 6.36 E) 5.20 2. A concentration cell is constructed using two Ni electrodes with Ni 2+ concentrations of 1.0 M and 1.00 10 4 M in the two half-cells. The reduction potential of Ni 2+ is 0.23 V. Calculate the potential of the cell at 25C. A) 0.368 V B) +0.118 V C) +0.132 V D) 0.132 V E) +0.0592 V 3. The complex ion Co(NH 3 ) 6 2+ (three unpaired electrons) is classified as: A) no way to tell B) weak field C) strong field Scrambled version A Page 1 Use the following to answer question 4. Refer to the galvanic cell below (the contents of each half-cell are written beneath each compartment): 0.10 M MnO 4- 0.40 M Cr 3+ 0.20 M Mn 2+ 0.30 M Cr 2 O 7 2- 0.010 M H + 0.010 M H + The standard reduction potentials are as follows: MnO 4- + 8H + + 5 e- Mn 2+ + 4H 2 O, & = 1.51 V Cr 2 O 7 2- + 14H + + 6 e- 2Cr 3+ + 7H 2 O, & = 1.33 V 4. What is the value of Q , the reaction quotient, for this cell reaction? A) 1.5 10 4 B) 1.5 10 41 C) 6.7 10 3 D) 6.7 10 40 5. If a reducing agent M reacts with an oxidizing agent N + to give M + and N, and the equilibrium constant for the reaction is 1.7, then what is the & value for the oxidation-reduction reaction? A) 0.0068 V B) 0.0068 V C) 0.014 V D) 0.014 V E) 0.027 V Scrambled version A Use the following to answer question 4. Refer to the galvanic cell below (the contents of each half-cell are written beneath each compartment): 0.10 M MnO 4- 0.40 M Cr 3+ 0.20 M Mn 2+ 0.30 M Cr 2 O 7 2- 0.010 M H + 0.010 M H + The standard reduction potentials are as follows: MnO 4- + 8H + + 5 e- Mn 2+ + 4H 2 O, & = 1.51 V Cr 2 O 7 2- + 14H + + 6 e- 2Cr 3+ + 7H 2 O, & = 1.33 V 4. What is the value of Q , the reaction quotient, for this cell reaction? A) 1.5 10 4 B) 1.5 10 41 C) 6.7 10 3 D) 6.7 10 40 5. If a reducing agent M reacts with an oxidizing agent N + to give M + and N, and the equilibrium constant for the reaction is 1.7, then what is the & value for the oxidation-reduction reaction? A) 0.0068 V B) 0.0068 V C) 0.014 V D) 0.014 V E) 0.027 V Scrambled version A Page 2 6. The color of a transition metal complex results from: A) nuclear magnetic resonance....
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This note was uploaded on 02/25/2011 for the course CHEM 222 taught by Professor Harding during the Fall '08 term at CUNY Hunter.

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Exam-3-A-E - Fall 2010 CHEMISTRY 104 Section 001 Exam 3...

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