spring09 140A final

spring09 140A final - To pick up your graded exam from a...

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To pick up your graded exam from a box outside 5100A Pacific Hall sign here: ________________________ CHEMISTRY 140A NAME (please print) FINAL EXAM FIRST LAST JUNE 11, 2009 SIGNATURE ID NUMBER LAST NAME OF PERSON SEATED ON YOUR RIGHT : LAST NAME OF PERSON SEATED OPN YOUR LEFT : DO NOT OPEN THE EXAM UNTIL YOU ARE TOLD TO DO SO Please sign your name on the top of each page. Please check to see that you have 13 pages (including this one). The one blank page may be used for scratch work, but DO NOT use the scratch page for answers. Answer in the space provided. Do not write answers on the back of a page. Question Points Score ________________________________________ 1. 50 _____ 2. 50 _____ 3. 50 _____ 4. 50 _____ ________________________________________ Total 200 _____ ________________________________________ H He Li Be B C N O F Ne Na Mg Al Si P S Cl Ar K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe Cs Ba La Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn
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NAME:__________________________ 2 1-i. (20 pts) (S)-monosodium glutamate, the active ingridient in MSG flavor enhancer, exhibits a specific rotation of +24. The condensed formula is shown below. HOCCHCH 2 CH 2 CO Na O NH 2 O a) Draw the Lewis structure of MSG (need not be in 3-D) and indicate the hybridization of the nitrogen atom and all oxygen atoms. b) Draw the three-dimensional structure of the (S)-enantiomer of MSG (show the amino group as simply NH 2 ). c) If a commercial sample of (S)-MSG were found to have a specific rotation of +12, what would be its optical purity? d) What would be the percentages of the S and R enantiomers in the mixture described above?
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This note was uploaded on 02/05/2011 for the course BILD 2 taught by Professor Schroeder during the Spring '08 term at UCSD.

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spring09 140A final - To pick up your graded exam from a...

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