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practice_exams_practice_Hour_Exam_I_2010_2

practice_exams_practice_Hour_Exam_I_2010_2 - Chem 312 Hour...

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Chem 312 Hour Exam I 1 Chemistry 312 Practice Hour Exam I Winter 2010 February 8, 2010 Total Points= 100 ______________________________________________________ Name: _____________________________ Sign your exam in the space provided below if you are willing to have your exam returned publicly (in your TA’s office). Scores will not be visible and displayed on the second page rather than the cover page. Signature: ________________________________________
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Chem 312 Hour Exam I 2 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? Circle the appropriate answer (3 pts) pH=5 pH=11 b. Is Pb 0 a better reducing agent at pH= 0 or pH=14? Circle the appropriate answer (3 pts) pH= 0 pH=14 c. What is the approximate redox potential of Pb +2 at pH= 3? (3 pts) E 1/2 = _____________ 1d. What is(are) the approximate redox potential(s) of Pb +2 at pH= 11? (4 pts) E 1/2 = _____________ 0 +1.0 –1.0 +0.5 –0.5 –0.75 –0.25 +0.25 +0.75 7 14 5 3 1 9 11 E (V) pH PbO 2 Pb(OH) 2 Pb 2+ Pb a.
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Chem 312 Hour Exam I 3 1e. What reaction occurs across the line labeled "a" at pH= 9 in the lead Pourbaix diagram? Write a balanced equation. (5 pts) 2. For this problem we’re going to determine what happens to the symmetry of the molecule shown below on the left when you replace one of the chlorides with a bromine. Cl Ru H 3 N NH 3 H 3 N NH 3 Cl + A. Cl Ru H 3 N NH 3 H 3 N NH 3 Br + B. a. First assign each molecule to a point group using the flow chart provided at the end of the exam.
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