Exam 1 - Fall 2006

Exam 1 - Fall 2006 - Chemistry 38 Exam I October 3, 2006...

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1 Chemistry 38 Exam I October 3, 2006 Form A There are 34 questions on this exam. Check that you have done all of the problems and filled in the first 34 bubbles on the scantron. Most questions are worth 4 points; there are several two-point questions clearly labeled in the text. The maximum score on this exam is 100 points. Instructions Answer sheet 1) On the scantron, you need to clearly fill: • your name and your student number , section number Section 001, 12:20 pm lecture Section 002, 3:35 pm lecture test form (white = test form A; yellow = test form B). 2) Use a #2 pencil Exam policy 1) No electronic devices of any kind, such as calculators, cell phones, or even more advanced digital watches, are allowed. Possession of such devices during the exam, whether in use or not, is grounds for awarding a zero on the exam. 2) Molecular models are allowed (no instruction pages are permitted, however). 3) There are some blank pages at the end of the test that can be used as scratch paper. 4) Relevant tables, including the periodic table, are attached at the end of this exam. 5) Numerical values given in one question apply only to that question, and should not be used in other questions, unless there is a specific instruction to do so. If necessary, the values from the provided tables should be used, even if they differ from values that you may remember from different sources. 6) Feel free to take this copy of the exam with you. The answer key will be posted on the web after the exam (under "News"). Hints 1) As you read the question, underline or circle key words to highlight them for yourself. 2) Questions have only one correct answer, unless indicated otherwise. No partial credit will be given. 3) There is no penalty for guessing.
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2 1. (4 pts) One chair conformation of cis -1,3-dimethylcyclohexane is 5.5 kcal/mol less stable than the other chair conformation. What is the strain energy (in kcal/mol) of the methyl-methyl 1,3- diaxial interaction? a) 3.7 b) 4.6 c) 2.9 d) 0.9 e) 0 2. (4 pts) Which statement about the following equilibrium is true? CH 3 CH 2 OH H 2 N CH 3 CH 2 O Na + + NH 3 pK a = 16 pK a = 36 II I III IV Na a) The equilibrium favors the products. b) In the reaction proceeding to the right, I is the base c) In the reaction proceeding to the left, IV is the base d) III is the strongest base in the system e) IV is the strongest acid in the system.
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Exam 1 - Fall 2006 - Chemistry 38 Exam I October 3, 2006...

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