Chem 24 Final

Chem 24 Final - 1 Ch24 Final. Winter 2011 Closed Homework....

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Unformatted text preview: 1 Ch24 Final. Winter 2011 Closed Homework. Closed Book. Open Notes and ppts. Time Limit: 4 hours Relevant equations are found on the last page. Please do all of your work on separate paper. 2 1. Calculate the Huckel pi-energy of trimethylenemethane: How does the total -electron energy of this system compare to the -electron energy of two isolated ethene molecules? 2. Using the Walsch correlation diagram given below for XH 3 molecules, determine which are planar, i.e., have a 120 bond angle. a) BH 3 b) CH 3 c) CH 3- 3. Predict the relative stabilities of N 2 , N 2 + and N 2- . 4. What are the four major steps of protein XRD? For each step, give a sentence or two about what is done, and what information is acquired. 5. Why are the outmost lying spots in a diffraction pattern so critical for fine features? (As seen with the duck) 6. What is the phase problem in X-Ray crystallography? 3 7. Explain why the heavy atom derivative method allows one to recover the phases. Why are multiple derivatives necessary? multiple derivatives necessary?...
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Chem 24 Final - 1 Ch24 Final. Winter 2011 Closed Homework....

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