Midterm-1 140A Fall 09-Key

Midterm-1 140A Fall 09-Key - Chemistry 140A Fall, 2009...

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Chemistry 140A TOTAL POSSIBLE: 250 Fall, 2009 POINTS MISSED: - 0 First Midterm Exam-250 points 10/20/09 TOTAL: 250 DO NOT OPEN THIS EXAM UNTIL INSTRUCTED TO DO SO. ....FILL OUT THE FOLLOWING INFORMATION NOW : . LAST NAME (Print): KEY FIRST NAME (Print): Ima PID: __________________________________________________ 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. (30 points) For each group of three Lewis structures shown below, two OR three of the structures shown can be considered resonance forms of each other. One of the structures may or may not be a resonance contributor of the other two. For each structure shown, indicate whether it is the best resonance contributor (of the resonance forms present), the worst resonance contributor (of the resonance forms present), intermediate quality resonance contributor (only if all 3 are resonance structures), or not a resonance contributor (compared to the other two). Note: if only two of the structures are resonance forms. there will not be and “intermediate quality” contributor; only a “best” and a “worst”. Indicate your choice by placing an “X” in the appropriate box. (2 pts. each correct answer) H 3 C CH 2 O H 3 C CH 2 O H 2 C CH 2 OH best resonance contributor worst resonance contributor intermediate quality res. con. not a resonance contributor best resonance contributor worst resonance contributor intermediate quality res. con. not a resonance contributor C C CH 2 C C CH 2 C C CH 2
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best resonance contributor worst resonance contributor intermediate quality res. con. not a resonance contributor best resonance contributor worst resonance contributor intermediate quality res. con. not a resonance contributor
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This note was uploaded on 08/21/2010 for the course CHEM 140A CHEM 140A taught by Professor Staff during the Fall '10 term at UCSD.

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Midterm-1 140A Fall 09-Key - Chemistry 140A Fall, 2009...

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