chem 140A, final key

chem 140A, final key - Chemistry 140A NAME: (please...

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1 Chemistry 140A NAME: (please print)__ Answer Key ____________ Professor Jerry Yang First Last Sp07, Final Examination June 12, 2007 Signature:__________________________________ PID #:_____________________________________ I give Professor Yang permission to leave my graded final exam and post my final grade for the class by PID number on the 6 th floor of Pacific Hall: Signature _______________________________ WRITE YOUR NAME AT THE TOP OF EVERY PAGE! USE NON-ERASABLE INK ONLY! Write the name of the person sitting: To your right_____________________ To your left _____________________ Please check your section number: A1 M 12-12:50PM ________ A6 W 8-8:50AM ________ A2 M 1-1:50PM ________ A7 W 9-9:50AM ________ A3 M 3-3:50PM ________ A8 W 10-10:50AM ________ A4 M 4-4:50PM ________ A9 F 8-8:50AM ________ A5 M 5-5:50PM ________ A10 F 9-9:50AM ________ Other (please explain): ________________________________________ DO NOT OPEN YOUR EXAM UNTIL YOU ARE TOLD. Please write the answers you want graded in the space provided. Do scratch work on the backs of the pages. The test should have 13 numbered pages. Check to make sure you have received a complete exam. A good piece of advice: Read carefully over the questions at least twice; Make sure that you understand exactly what is being asked; avoid sloppy structures or writing. Good Luck! DO NOT WRITE BELOW THIS LINE I. ___________ (8) VI. ___________ (24) II. ___________ (16) VII. ___________ (30) III. ___________ (30) VIII. ___________ (20) IV. ___________ (32) IX. ___________ (20) V. ___________ (20) Total ___________ (200)
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2 I. [8 points] NAME: (please print)__________________________ First Last Consider the staggered and eclipsed conformations that arise from the rotation around the bond between carbons 2 and 3 in the following substituted butanes: a. Circle the hydrocarbon above for which the following energy profile applies: b. Using Newman projections, draw the conformations around the C2-C3 bond of this molecule that correspond to the two starred positions on the energy diagram (use the partial templates provided): *1 *2 H H CH 3 CH 3 CH 3 H H 3 C H H CH 3 CH 3 H
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3 II. [16 points] NAME: (please print)__________________________ First Last Rank the following isomers of C 8 H 16 in order of decreasing standard free enthalpy of formation ( i.e., place the letter corresponding to the structures in the boxes provided ).
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This note was uploaded on 01/10/2009 for the course CHEM 140A taught by Professor Whiteshell during the Fall '04 term at UCSD.

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chem 140A, final key - Chemistry 140A NAME: (please...

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