exam 1u key - u Chemistry 312 Summer 2011 Name Exam 1(Redox...

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u Chemistry 312, Summer 2011 Name: 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. The Latimer diagram for plutonium in acidic solutions is given below, appropriate since Latimer’s enduring work was in characterizing plutonium. For full credit , you must show details of all calculation-related steps. a. (5 points) Determine the potential for the reduction of Pu 4+ to Pu 2+ in an acidic solution. Remember units. E ° ( PuO 2 + " Pu 3 + ) = (1) E ° ( Pu 4 + " Pu 3 + ) + (1) E ° ( Pu 3 + " Pu 2 + ) (1 + 1) = –1.245 V b. (5 points) Construct a Frost diagram for plutonium using the usual conventions. The graph need not be completely to scale, but should show axes labels (with units), clearly- labelled data points and tick marks. Be especially careful of negative signs.
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u oxid # 5+ 4+ 3+ 2+ 0 n (e ) 1 1 1 2 E (V) 1.04 1.01 -3.5 -1.2 n E 1.04 1.01 -3.5 -2.4 total nE -3.85 -4.89 -5.9 -2.4 0 c. (2 points) Which species of plutonium, if any, will disproportionate ? Explain how you can tell.
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