115b_exam1_key_08_

115b_exam1_key_08_ - Chem 115b Spring 2008 Exam 1 January...

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Chem 115b Spring 2008 Print Name: Last First Exam 1 Last 3 digits of Student ID # January 31, 2008 TA's Name P r o f e s s o r s R e i s l e r / K r y l o v M a j o r Questions Points Score Grader 1 6 2 6 3 16 4 14 5 12 6 16 7 20 8 10 Total 100 INSTRUCTIONS 1. YOU MUST SHOW YOUR WORK TO RECEIVE CREDIT. 2. If necessary, please continue your solutions on the back of the preceding page (facing you). 3. YOU MUST USE BLACK INK TO BE ABLE TO REQUEST A REGRADE 4. Please read each question carefully before you write your answer. 5. There are 8 questions on 7 pages. ± Please Sign Below: I certify that I have observed all the rules of Academic Integrity while taking this examination. Signature:
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1 1. (Points 6) Complete the following statements relating to the production of ammonia by the Haber process, for which the overall reaction is N 2 (g) + 3H 2 (g) 2NH 3 (g). A. The rate of disappearance of N 2 is ___1/3____ times the rate of disappearance of H 2 . B. The rate of formation of NH 3 is _____2/3__ times the rate of disappearance of H 2 . C. The rate of formation of NH 3 is _____2__ times the rate of disappearance of N 2 . 2. (6 points) You are doing experiments with the enzyme catalase converting the substrate S = H 2 O 2 to H 2 O + O 2 . You know the initial concentration of the enzyme, [E 0 ], and you can change the concentration of the substrate [S]. You need to determine the values k 2 and k m of the enzyme catalase. Suggest how you can determine the values of k 2 and k m quantitatively and accurately from a graphical plot of the results of your experiments. Getting the inverse of this equation you obtain: Plotting 1/R vs 1[S] gives a straight line with an intercept: k 2 [ E 0 ] from which k 2 can be obtained. The slope is: From which k m can be derived, because k 2 and [ E 0 ] are known.
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This note was uploaded on 07/14/2008 for the course CHEM 115BL taught by Professor Qin,reisler during the Spring '08 term at USC.

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115b_exam1_key_08_ - Chem 115b Spring 2008 Exam 1 January...

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