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exam_answers_Hour_Exam_I_key - Chem 312 Exam I Chemistry...

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Chem 312 Exam I 1 Chemistry 312 Hour Exam I Winter 2010 February 12, 2010 Total Points= 100 ______________________________________________________ Name: ____________ Key _________________ 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 Exam I 2 1a. What symmetry operation is shown below? Be specific. (5 pts) H 2 H 4 H 6 H 5 H 1 H 3 H 1 H 6 H 5 H 4 H 3 H 2 Symmetry operation: C 3 ______________ 1b. What symmetry operation is shown below? Be specific. (5 pts) H 2 H 4 H 6 H 5 H 1 H 3 H 5 H 1 H 3 H 2 H 4 H 6 Symmetry operation: i ____________________ 1c. What symmetry operation is shown below? Be specific. (5 pts) H 2 H 4 H 6 H 5 H 1 H 3 H 4 H 2 H 3 H 1 H 5 H 6 Symmetry operation: C 2 _________________ 2. Illustrate a C 4 symmetry operation for the octahedral (all L= identical) molecule below by showing what happens to the numbering scheme upon performance of the operation. (8 pts)
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Chem 312 Exam I 3 L 4 L 5 L 6 L 1 L 3 L 2 L 4 L 2 L 5 L 6 L 3 L 1 C 4 clockwise L 4 L 5 L 6 L 1 L 3 L 2 L 4 L 6 L 1
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