Midterm_1_140AFall05

Midterm_1_140AFall05 - Chemistry 140A Fall, 2005 First...

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Chemistry 140A Fall, 2005 First Midterm Exam-250 points 10/18/05 DO NOT OPEN THIS EXAM UNTIL INSTRUCTED TO DO SO. ....FILL OUT THE FOLLOWING INFORMATION NOW : . YOUR NAME (Print): . SIGNATURE: . ID checker initials: . If you wish to have any answers considered for a re-grade, your exam must be completed in INK .
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1. (24 points) Draw the Lewis dot structure for TWO resonance contributors of hydrazoic acid, HN 3 . Be sure to draw all valence electrons and indicate charges where appropriate. DO NOT use straight lines for bonds ; instead, use dots for bonds and valence electrons. When choosing resonance contributors to record as your answer, choose ones such that BOTH structures you draw satisfy the octet for all appropriate atoms. 2. (18 points) Draw all possible atomic energy orbital levels from 1s through and including 4p listing them from lowest energy to highest. Next, fill in the electrons for silicon . example: If I asked you to draw all possible atomic energy orbital levels from 1s through 2p listing them from lowest energy to highest and fill in the electrons for helium, the correct answer would be: E 1s 2s 2p
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3. (27 points) Consider the following reaction coordinate-energy diagram drawn for the reaction shown: A + B C D + E step 1 step 2 RC C A+B TS TS D+E E Ea Ea 20 kcal
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(3 pts) Is step #2 of the sequence exothermic or endothermic? (circle your choice)
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This note was uploaded on 11/16/2008 for the course CHEM 140A taught by Professor Whiteshell during the Fall '04 term at UCSD.

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Midterm_1_140AFall05 - Chemistry 140A Fall, 2005 First...

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