sample exam 1 - Chemistry 312, Summer 2011 Name: Sample...

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1 Chemistry 312, Summer 2011 Name: Sample exam 1 (Redox chemistry and group theory) Answer all questions; 50 points are possible. The exam is closed-book and closed-note; a periodic table and other information is provided within this exam. The exam length is one hour, and show your work for full credit. Some equations that may prove useful: n = 1 h C " ( # red ( C )) ( # irred ( C )) ( coefficient of C ) E ° ( n 1 + n 2 ) = n 1 E ° ( n 1 ) + n 2 E ° ( n 2 ) n 1 + n 2 E = E ° " m n # $ % ' ( 0.059 pH ) * + , - . 2 H 2 O + 2 e H 2 + 2 OH 1/2 = 0.00 V 2 H 2 O O 2 + 4 H + + 4 e 1/2 = +1.23 V 1. Answer the following questions about the simplified Pourbaix diagram of lead (Pb) shown below. a. Is PbO 2 a better oxidizing agent at pH=5 or pH=11? pH=5 b. Is Pb 0 a better reducing agent at pH= 0 or pH=14? pH=14
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2 c. What is the approximate redox potential of Pb +2 at pH= 3? E
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This note was uploaded on 01/19/2012 for the course CHEM 312 taught by Professor Staff during the Summer '08 term at University of Washington.

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sample exam 1 - Chemistry 312, Summer 2011 Name: Sample...

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