8B_quiz1a_key - Chem 8B winter 2008 Quiz#1A Name_KEY(print...

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Chem 8B, winter 2008 Name: _____ KEY _______________ ( print clearly) Quiz #1A (Last, First) TA: _______________________ • DO NOT start the quiz until you are instructed. • You must stop writing and turn in your quiz when time is called. • Ambiguous or incomplete answers will not get full credit. • Please give clear and concise answers – a single sentence or phrase should be sufficient to accurately convey the information required. “Brevity is the soul of wit” – Shakespeare Problem # Score 1. [12] ________ 2. [10] ________ 3. [12] ________ 4. [6] ________ Total [40] ________/40 Bonus [5] _________
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Chem 8B, quiz 1A 1. Please indicate true (T) or false (F) for the following statements based on lab and lecture materials (2 pts each): ___ T ___ Building molecular models allows you to see that the O, C, and N atoms in an amide group are planar and there are two resonance forms. ___ F __ Building molecular models allows you to see that the chair conformation of cyclohexane is less stable than the boat conformation. ___ F __ The electrons in a benzene molecule are localized in individual p-orbitals. ___ T __ The special stability of benzene is referred to as aromaticity. ___ F __ Even without a catalyst, the reaction of benzene with Br 2 is rapid, as observed by the disappearance of the red color of bromine. ___ F __ Because benzene is a resonance hybrid, it cannot be a nucleophile.
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