TERNANSKY Midterm 1 2005 FA

TERNANSKY Midterm 1 2005 FA - Chemistry 140A Fall, 2005...

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Unformatted text preview: 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): Ima Key . SIGNATURE: . ID checker initials: . If you wish to have any answers considered for a re-grade, your exam must be completed in INK . 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. H N N N H N N N 10 points each correct structure; 1 point each for brackets; double arrow; curved arrows (2 total) = 24 points 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 E 1s 2s 2p 3s 4s 3p 3d 4p 6 points for proper orbital listing; 5 points for having 14 electrons; 7 points for proper Aufbau filling 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 (3 pts) Is step #2 of the sequence...
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This note was uploaded on 10/30/2008 for the course CHEM 140A taught by Professor Whiteshell during the Spring '04 term at UCSD.

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TERNANSKY Midterm 1 2005 FA - Chemistry 140A Fall, 2005...

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