Midterm_1_140A_Fall06_BLANK_Ternansky

Midterm_1_140A_Fall06_BLANK_Ternansky - Chemistry 140A...

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Chemistry 140A Fall, 2006 First Midterm Exam-250 points 10/17/06 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. (22 points) Draw the Lewis dot structure for THREE resonance contributors of the molecule shown . Use electron-pushing arrows to indicate how the resonance structures are related to each other. Be sure to draw all valence electrons and clearly indicate charges where appropriate. Use straight lines for bonds and dots for valence electrons. (That is, use Kekule drawing) When choosing resonance contributors to record as your answer, choose ones such that ALL structures you draw satisfy the octet for all appropriate atoms. (-)CH 2 NO 2 2. (8 points) Circle the best resonance contributor above. Give the reason for selection of this as the best resonance contributor:
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3. Consider the following compound for answering the next questions: O O H 2 N OH H H *H 1 2 3 4 5 6 (3pts) Write the molecular formula for this molecule (9 pts) Classify carbons #3, #4 and #5 as primary, secondary or tertiary: #3 : ____________ #4 : ____________
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This note was uploaded on 07/15/2008 for the course CHEM 140A taught by Professor Whiteshell during the Fall '04 term at UCSD.

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Midterm_1_140A_Fall06_BLANK_Ternansky - Chemistry 140A...

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