practice_midterm1_2007

practice_midterm1_2007 - Name: Last Student ID: First...

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Name: Last First 1 Student ID: Please put your name on every page. BIS 102, Fall 2007 Practice Midterm 1 Professor Toney
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Name: Last First 2 Short Answer (points as indicated) 1. a) (5 pts) What is the final pH of a solution obtained by mixing 50 ml of 0.3 M acetic acid with 50 ml of 0.1 M KOH? (pK a of acetic acid = 4.75). Show your work. b) (5 pts) What is the net (average) charge per molecule of acetate at this pH? 2. Two reactions have the following characteristics at 25°C: Rxn 1: A ' B G = -20 kcal/mol Rxn 2: C ' D K eq = 100 RT (at room temperature) = 0.59 kcal/mol Which reaction proceeds farthest from left to right? How do you know?
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Name: Last First 3 3. Draw the structures of the amino acids whose side chains would be charged at neutral pH. Give the one and three letter codes for them below the structures. Give the pK a values for the side chain functional group.
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Name: Last First 4 4. An enzyme catalyzed reaction was carried out in a solution buffered with 0.1 M HEPES (pK a = 7.5) at pH 7.7.
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practice_midterm1_2007 - Name: Last Student ID: First...

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