Chm 1320 april 2001 page 12 of 15 last name or

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CHM-1320 April 2001 page 12 of 15 Last name or student number: ..................................... LABORATORY PART (Part C) Experiment #1. (a) Which of the following compounds would you expect to have the highest boiling point? Which the lowest? Explain. (b) A pair of students carried out the isolation of caffeine from tea and obtained a white substance. They determined the melting point to be 236 - 238˚C. The reported melting point of caffeine is 237 - 238˚C. Describe a simple experiment that could be used to determine whether the sample isolated by the students is indeed caffeine. On what basis will the students make the decision? OH O (a) (b) (c)
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CHM-1320 April 2001 page 13 of 15 Last name or student number: ..................................... Experiment #8 In the bromination of 1,2-diphenylethane by bromine the main product is -l,2-dibromo- l,2-diphenylethane. The reaction was started with 2 grams of 1,2- diphenylethane. (A) Calculate the volume of bromine needed (its density is 3.0 g/ml) (B) Which was the yield of the reaction if 1.5 grams of product were obtained. (C) Why was light needed in this reaction?
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CHM-1320 April 2001 page 14 of 15 Last name or student number: ..................................... Experiment #4 a) In the hydrolysis of tert-butyl chloride, an S N 1 reaction, what effect would the following have on the rate of the reaction and why? i. an increase in the concentration of tert-butyl chloride ii. a change in the solvent (for example, from acetone to water) b) In the laboratory you determined the reaction rate based on 10% hydrolysis. How did you establish that 10% of the reaction had occurred?
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