2510_Exam_Summer_2008 - Cornell University Chemistry 251...

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Cornell University Chemistry 251 Final Examination July 31, 2008 Instructions: Read all questions completely before answering. You may find it helpful to first read through the entire exam and then answer those questions that you find easier and later return to those you find more difficult. Please follow the directions for each question as answers that are not written where or how it is specified in the question will lose all credit. Good Luck!!! Problem Score Possible 1 12 2 10 3 8 4 10 5 14 6 10 7 12 8 8 9 8 10 8 Total 100 Name:___________________________________________________ Signature:________________________________________________
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Page 1 of 8 1) ( 12 ) Al D. Hyde has performed the following reaction and noticed two products when he was only expecting one. A) Propose mechanisms to account for the formation of each product Al has observed. + N O O O Heat N H H O O + O Product A Product B B) Offer two different suggestions (i.e. technique or reaction changes) as to how Al could possibly reduce the amount of Product B in future reactions.
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Page 2 of 8 2) ( 10 ) The structure of a soap molecule is shown below. Explain, in chemical terms, how soap helps to wash grease and oils from your hair or skin. ONa O 3) ( 8 ) True or False? Write “ T ” on the line before each statemet for true and “ F ” for false. ______ A. Identical Rf values on a silica gel TLC plate prove the two compounds are identical. ______ B. Two liquids that boil at the same temperature can be purified through distillation. ______ C. Drying an organic layer after an extraction with magnesium sulfate will produce a colorless solution when it is fully dry. ______ D. Heating a sealed glass reaction vessel is a good idea. ______ E. Safety showers are to be used primarily when you are on fire. ______ F. After splashing a solvent in your eye, the first thing you should do is find your way to the eye wash and flush them out. ______ G. The first thing you should do with a burning reaction on a hot plate is switch
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This note was uploaded on 12/17/2008 for the course CHEM 2510 taught by Professor Russo,s during the Fall '07 term at Cornell University (Engineering School).

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2510_Exam_Summer_2008 - Cornell University Chemistry 251...

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