14C_s11_lec02_finalA_key - Chem 14C Lecture 2 Spring 2011...

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Chem 14C Lecture 2 Spring 2011 Final Exam Part A Solutions Page 1 Statistics : High score, average and low score will be posted on the course web site after exam grading is complete. The exam is ready to be picked up when these numbers are posted. A note about exam keys : The answers presented here may be significantly longer than expected from a student taking the exam. An exam key serves not only to reveal what was expected, but to instruct you as well. To see the final course grade cutoffs, consult the grading scale on the Chem 14C course web page. 1. Hydrophilic : A molecule or part of a molecule with high polarity, usually characterized by the presence of a significant number of polar bonds and/or hydrogen bond donors and/or hydrogen bond acceptors. 2. Ascorbic acid is not a lipid because it is hydrophilic. 3. OH b . Removal of H b gives the conjugate base with the greatest resonance delocalization of its electron density . 4. HOAc < HAsc - Asc (the conjugate base of HAsc) has a greater number of resonance contributors (to delocalize electron density) compared with - OAc (the conjugate base of acetic acid) . 5. 4.1 In question 4 we determined that acetic acid is less acidic than ascorbic acid. Less acidic = higher pK a . 6.
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This note was uploaded on 09/06/2011 for the course CHEM 140A taught by Professor Whiteshell during the Fall '04 term at UCSD.

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14C_s11_lec02_finalA_key - Chem 14C Lecture 2 Spring 2011...

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