whitlock_s07_ex1

whitlock_s07_ex1 - Chem 104 section 3, Exam 1 VWednesday...

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Unformatted text preview: Chem 104 section 3, Exam 1 VWednesday Feb 14, 2007 _ ' Your section's TA ' FOUR PAGES of questions follow this page 1. For optimum results show your work. Put your answers in the little boxes provided. 2. A page labeled "Scratch" has been appended to the exam. it may be used for scratch calculations and doodling but will not be graded. 3. Indicate your answer clearly. A question with more than one answer gets graded in an arbitrary manner. 4. Don’t draw awful structures with dangling valences etc. Remember: when you draw a structure you're . _ making a statement. Draw structures as "CH3CH2.." or “CH3-CH2-" rather than line structures, although the latter will be accepted if correct (by our criteria). 5. And read The questions carefully! Make sure you know exactly what's being asked. We don't dish out much credit for answering the wrong question. 1 (10 points) We wish to prepare 600 mL of a 1.24 molar solution of aluminum sulfate (Al2(SO4)3) in water. How many grams of the salt are required? grams 2 (5 points) Aluminum sulfate reacts with barium chloride to form insoluble barium sulfate. Write and balance the equation for this metathesis reaction. Make sure you have the formulas correct! eqn 3. (20 pts) Consider the AIDS drug Crixivan. Hydrolysis of crixivan affords (in addition to other pieces) two amines, one C4H11N, and one | CgH11NO. Draw them. ‘ ‘- DEC 4. (20 pts) Consider the cycloalkane 1,4-diethylcyclohexane ("DEC"): Chlorination of DEC gives a mixture of different monochloro derivatives, each of the formula C10H19Cl. Draw them. In addition, draw a circle around each one that is chiral. Make sure you draw structures derived from DEC, and don't draw duplicates! 5. (10 pts) Draw an ester that has the molecularformula 06H1202 and is chiral. ester 6. (10 pts) Draw an alkene with the formula CgH15 that is chiral, but reacts with hydrogen in the presence of platinum to give an achiral alkane (C8H13). C8H16 7(10 pts) A polymer has the foilowing repeating structure. Hydrolysis of it affords what? Us JC-LA M3 /fi\/\ M3 0 F5 N o N o HMO? _ H H H Hydrolysis product(s) 8. (10 pts) We are given a tripeptide ("TP"). Examination of its chemistry yields the following observations: 1. Complete hydrolysis affords glycine and valine in a 2:1 molar ratio respectively. 2. Partial (incomplete) hydrolysis gives in addition to other stuff the peptide glycyl glycine. 3. "End group analysis" shows that the N-terminal amino acid is valine. Write the sequence (using the three-letter amino acid notation) of a tripeptide that is consistent with ‘ these observations. tripeptide sequence 9. (5 pts). Draw, using the condensed structural notation, the chemical structure of the above tripeptide. Structure, drawn as in CH3CH2 etc. AMINO ACIDS O HkOH D 0 0 ‘ \rlkOH OH OH NH2 3.13., A leu, L val: V gly, G NH2 Glycine Aianine Léucine Valine 0 U D O HO/WAOH ' HS/YKOH HQMOH NOH NHZ ser, 8 _ NHz cys, C NH2 thr, T NH2 ile, 1 Sering Cysteine Threonine Isoleucine D D D O D H N /S\/\rU\DH 2 MOI”. HzNwigH DH N H 0 ~ NH2 met,“ “Hz asnjg “H2 gln,Q I H pro,P Methionine Asparagine o 0' o _ ' OH H OH NH2 NH2 \ “Hz H0 I?! trp, W H Glutamine Protine phe, F ‘ tyr, Y Phenylahnine ‘ Tyrosine Tryptophane o 0 O 0 0 NH2 asp,D NH2 qu,E k “HZ ‘ _ N his, H Aspamc acid Glutamic acid Histidine NH 0 ' ,LL ' ‘ ° HZN Pil/\/Y“\OH I HZNW/YLDH H R “"2 We, K Arginine ‘LVSine ...
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This note was uploaded on 03/27/2008 for the course CHEM 104 taught by Professor Tomasik during the Spring '08 term at Wisconsin.

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whitlock_s07_ex1 - Chem 104 section 3, Exam 1 VWednesday...

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