115b_exam2key1_07

115b_exam2key1_07 - Chem 115b Spring 2007 Exam 2 February...

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Chem 115b Spring 2007 Print Name: Last First Exam 2 Last 3 digits of Student ID # February 15, 2007 TA's Name P r o f e s s o r R e i s l e r M a j o r Questions Points Score Grader 1 10 2 18 3 14 4 10 5 10 6 9 7 5 8 24 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 6 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. (10 pts) (i) (4 pts) Circle the correct statements : a) In a chemical reaction both the catalyzed and uncatalyzed pathways must have the same rate law. X b) The activation energy of the catalyzed reaction is lower than that of the uncatalyzed reaction. c) Increasing the temperature increases the reaction rate because it lowers the activation energy. X d) In heterogeneous catalysis, the reaction rate may not increase even when the concentration of the reactant is increased. (ii) (2 pts) Photodissociation is the most likely outcome if an electron in the molecule is promoted to a (circle the correct answer): a) σ orbital X b) σ * orbital c) π orbital d) nonbonding p orbital (iii) (4 pts) The photoelectron spectrum of NO shows a series of close-lying lines separated by 0.1 eV and centered at 12.5 eV and a single line at 9.25 eV. The series of close lying lines could belong to a removal of an electron from (circle all possibilities): X a) bonding orbital b) nonbonding orbital X c) antibonding orbital d) too little information to tell anything
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2 2. (18 pts) (i) (4 pts)
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115b_exam2key1_07 - Chem 115b Spring 2007 Exam 2 February...

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