labexamCHEM 2230 LB

labexamCHEM 2230 LB - CHEM 2230 LB Organic Chemistry 1...

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CHEM 2230 LB Organic Chemistry 1 Laboratory Sample Final Exam Xavier University of Louisiana Note: This sample final exam covers the same experiments that were covered in the fall 1997 semester of Organic Chemistry 1 Lab, but these questions do not necessarily have the same format or cover exactly the same material as the questions on the actual current final. Note: Due to limitations of the html format, numbers in formulas are given in plain text when they should be subscripts or superscripts (example: H2O). Please do not do this on quizzes. 1. A. compound that causes tumors is called a . .. a. mutagen. b. carcinogen. c. teratogen. d. lachrymator. 2. If some acid gets into your eyes, which of the following should you NOT do ? a. Add a base to neutralize it. b. Wash with water. c. Report to your instructor. d. Report to the medical center. 3. The melting point of potassium bromide is higher than the melting point of naphthalene because. .. a. potassium bromide is an ionic compound. b. naphthalene is a flat molecule. c. potassium bromide molecules are much larger. d. potassium bromide has intermolecular hydrogen bonds. 4. If all other factors stay the same, when the size of a molecule increases, the melting point . .. a. stays the same. b. range will become wider. c. range will become narrower. d. also increases 5. If a sample of benzoic acid (m.p. 121-122 degrees C) has become contaminated with a small amount of urea (m.p. 133-134 degrees C), a soluble impurity, its melting point range would be expected to be . .. a. raised and narrowed. b. lowered and narrowed. c. raised and broadened. d. lowered and broadened. 6. Suction filtration involves . .. a. sucking the solvent out with a pipette.
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b. using a Buchner or Hirsch funnel and filtration flask. c. using fluted filter paper. d. using Norit. 7. A student weighed 2.3 g of impure solid and recrystallized it. The mass of the purified crystals was 0.41 g. The percent recovery was . .. a. 42 %. b. 18 %. c. 12 %. d. 5.5%. 8. Which of the following is not a desirable property for a recrystallization solvent ? a. high boiling point b. low toxicity c. no reactivity with the solute d. ability to dissolve the solute when hot 9. Norit (activated charcoal) is used in a recrystallization process for . .. a. removing colored impurities. b. removing water from organic solvents. c. insuring smooth boiling. d. aiding in the filtration of insoluble impurities. 10. If you were purifying b-carotene, which is a red solid, how much Norit would you add to the solution ? a. 10 - 12 pellets b. about 0.1% of the mass of the b-carotene c. as mush as necessary to remove all of the color d. none 11. The best definition of sublimation is. .. a. A substance goes from a solid to a liquid
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This note was uploaded on 07/21/2010 for the course SCIENCE CHEM 2204 taught by Professor Buist during the Spring '10 term at Carleton.

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labexamCHEM 2230 LB - CHEM 2230 LB Organic Chemistry 1...

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