Exam_3_KEY_Chem_1230_Nov_2007

Exam_3_KEY_Chem_1230_Nov_2007 - CHM 1230 Exam III Fall 2007...

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CHM 1230 Exam III Fall 2007 KEY FOR ALL VERSIONS Experiments 9B, 12A, 14, and 5A ü preliminaries 1. Identify the safety precautions that are specific to each of the experiments 3 pts each; total of 12 a. Experiment 9 B : From Oil of Wintergreen to Salicylic Acid • be careful using acids and bases (if spilled notify TA, wash contaminated area) • be careful not to be burned by hot equipment or the Bunsen burner • do not ingest the product • be sure gas is turned off at end b. Experiment 12 A : Molar Mass from Freezing Point Depression • Cylclohexane is flammable. No open flames are allowed during this experiment. • Never use your mouth to draw liquid into a pipet. Use a rubber suction bulb or some other suction device. c. Experiment 14 : The Rate of an Iodine Clock Reaction • Solutions of acid H 2 SO 4 can cause chemical burns in addition to ruining your clothing. Do not use your finger as a stopper when mixing these solutions. If you spill any of these solutions on you, wash the contaminated area thoroughly and report the incident to your laboratory instructor as you may require further treatment. • Avoid burning your fingers. Do not touch the iron ring or wire gauze at any time while the flame is being used. d. Experiment 15 A : Le Châtelier’ s Principle • Solutions of ammonia, HCl and NaOH can cause chemical burns in addition to ruining your clothing. Do not use your finger as a stopper when mixing these solutions. If you spill any of these solutions on you, wash the contaminated area thoroughly and report the incident to your laboratory instructor as you may require further treatment. • Avoid burning your fingers. Do not touch the iron ring or wire gauze at any time while the flame is being used. • Make sure your gas outlet and those of your neighbors are closed before you leave the laboratory.
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2. Experiment 9B Salicylic Acid from Oil of Wintergreen a. (8 pts) Name compounds A, B, C, and D, shown below. A
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This note was uploaded on 04/02/2008 for the course CHM 1230 taught by Professor Mcclain during the Fall '07 term at Wayne State University.

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Exam_3_KEY_Chem_1230_Nov_2007 - CHM 1230 Exam III Fall 2007...

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