Final6A

Final6A - Final Exam Chem 6A 4/9/08 Name:_ Perm:_ Please...

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Final Exam Chem 6A 5/12/09 Name:_____________________ Perm:_____________________ Please place all answers on your scantron card with a #2 pencil. Each question can has only one correct answer. Please choose the best answer for each question. You have 180 minutes. Satan and the Professor Satan entered a large building where a class was being held. Everyone, upon seeing satan, ran screaming from the building. The only person left inside was the elderly gray headed professor who had been teaching the organic class. Satan spoke to the professor saying; "Do you know who I am?" "Sure I do." was the teachers reply. Hearing that there was no fear in his voice the devil asked; "Do you know I could destroy you with a word?" "Possibly" stated the old timer. Becoming quite perturbed at the total lack of terror, the devil screamed; "I could banish you to hell for eternity, why do you not fear me?" Unshaken, the professor replied; "I've taught for forty years. I've graduated no less than fifty Ph.D. students many of whom are now professors themselves at other universities. I'm pretty sure that several of them were your children.”
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59. Which of the following pieces of glassware is called a Hickman Still Head? a. b. c. d. e. QuickTime™ and a TIFF (Uncompressed) decompressor are needed to see this picture. 60. If at STP, a solid sublimes at a lower temperature than it's melting point, how would it be possible to determine the melting point? a. Heat more rapidly b. Decrease the pressure c. increase the pressure d. It is not possible to obtain the melting point e. Use a microwave to heat it 61. A sharp melting point can be indicative of which of the following a. A pure substance b. An impure substance c. A eutectic point d. Both a and c 62. If benzoic acid is placed in a separatory funnel containing dichloromethane and 3M NaHCO 3 , in which layer will the majority of the organic compound reside? a. organic layer b. aqueous acid layer c. bottom layer d. the NaHCO 3 layer
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63. Which of the following would be the fastest method to separate an alkyl amine from an organic acid? a. Sublimation b. Recrystallization c. Distillation d. Liquid-liquid extraction e. Chromatography 64. Properties of sodium sulfate include a. hygroscopic b. slightly basic c. tectonic d. Both a and b e. None of the above 65. If 1.0 grams of an organic compound in CH 2 Cl 2 , has a CH 2 Cl 2 /H 2 O partition coefficient of 0.3, and is subjected to equal amount of water. After the first separation, how many more times would it have to be similarly extracted to remove 0.410 grams (41.0%) from the organic compound from the aqueous layer. a. >5 b. 1 c. 2 d. 3 e. 4 66. A theoretical plate is: a. The difference between bp for two liquids given their volumes b. The % difference between partial pressure of vapor vs the % difference between liquid components during condensation c. The greatest amount of product that can be formed given some limiting reagent. d.
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Final6A - Final Exam Chem 6A 4/9/08 Name:_ Perm:_ Please...

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