14C_s10_finalA

14C_s10_finalA - Chemistry 14C 1. Spring 2010 Final Exam...

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Chemistry 14C Spring 2010 Final Exam Part A Page 1 Page 1 score = 1. (12) In the box below each molecule write its boiling point. Each number may be used only once. (a) Boiling point choices: 101 o C, 158 o C, 161 o C, and 182 o C. OH OH CH 3 SH (b) Boiling point choices: 102 o C, 166 o C, 210 o C, and 239 o C. CH 3 O OCH 3 HO OCH 3 HO OH OH HO (c) Boiling point choices: 49 o C, 80 o C, 177 o C, and 218 o C. 2. (2) Write the names of the two noncovalent molecular forces which have the greatest impact on the boiling point ranking of the molecules in question 1(c). 3. (3) Draw an isomer of molecule A that has a lower boiling point than molecule A itself. CF 3 CF 2 OH Molecule A 4. (3) Draw in the box the isomer of C 5 H 13 N that has the highest boiling point . 5. (4) Draw a hydrogen bond involving one molecule of water (as the hydrogen bond donor) with the nitrogen atom that is the best hydrogen bond acceptor atom in the molecule below. H 2 N NH 2 O NH 2 Cl Cl
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Chemistry 14C Spring 2010 Final Exam Part A Page 2 Page 2 score = 6. (6) In 2009 some workers reported their studies on synthetic DNA that contains selenium. Using x-ray crystallography they discovered an abnormally short distance between a CH 3 Se hydrogen atom and the phosphate oxygen atom. The authors claim this is due to hydrogen bonding. Do you believe the authors’ claim? In the statement below circle ‘is’ or ‘is not’ (as appropriate). If you circle ‘is not’ complete the explanation by adding no more than 25 words
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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_s10_finalA - Chemistry 14C 1. Spring 2010 Final Exam...

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