e4_131_f08 - CHE 131 Final Exam, Fall 2008 Multiple Choice...

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CHE 131 Final Exam, Fall 2008 Multiple Choice On the Scantron form, bubble in the letter of the one choice that best completes the statement or answers the question. No credit will be given for multiple answers. ____ 1. What is the final oxidation product for a secondary alcohol? A. aldehyde D. carboxylic acid B. amine E. ester C. ketone ____ 2. Which atom is reduced in this reaction? Cu(s) + 4 H + (aq) + 2 NO 3 (aq) Æ Cu 2+ (aq) + 2 NO 2 (g) + 2 H 2 O(l) A. Cu B. H C. N D. O E. None, because this is not a redox reaction ____ 3. A 3 gram sample of hydrogen gas found at Los Alamos Laboratory was determined to contain 1 gram of 1 H and 2 gram of 2 H. What are the relative abundances of the two isotopes? The atomic mass of 1 H is 1.0 amu, the atomic mass of 2 H is 2.0 amu. A. 50% 1 H and 50% 2 H B. 67% 1 H and 33% 2 H C. 33% 1 H and 67% 2 H D. 75% 1 H and 25% 2 H E. 25% 1 H and 75% 2 H
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____ 4. Which one of the following statements about intermolecular interactions in dimethylether, CH 3 O–CH 3 is incorrect ? A. The intermolecular interactions in dimethylether are dominated by dipole-dipole interactions. B. The interactions between dimethylether molecules also include dipole-induced dipole interactions. C. The interactions between dimethylether molecules also include induced dipole- induced dipole interactions. D. The interactions between dimethylether molecules also include hydrogen bonds. E. If all of the above statements are correct, choose this answer. ____ 5. Which of the following compounds has the lowest solubility in water? A. C H 2 H 2 C C H 2 NH 2 H 3 C D. C H 2 H 2 C C H 2 H N H 3 C N H 2 H 2 C C H 2 OH B. C H 2 H 2 C C H 2 H N H 3 C C H 2 H 2 C CH 3 E. C H 2 H 2 C C H 2 H N H 2 C N H 2 H 2 C C H 2 OH HO C. C H 2 H 2 C C H 2 N H 3 C C H 2 H 2 C CH 3 H 2 C H 2 C CH 3 ____ 6. Water was one of our molecules of the week. Which one of the following statements is incorrect ? A. Water has an unusually high boiling point (for its low molar mass) because the intermolecular interactions are very strong. B. The intermolecular interactions between water molecules are referred to as hydrogen bonds. C. The density of ice is lower than the density of water because the ice structure features hollow channels. D. The hydrogen bonds in water are strong because the O–H dipoles are small and the intermolecular H O distances are long. E. On average the water molecules in liquid water are able to engage in four hydrogen bonds.
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____ 7. A scientist sets up an experiment to observe compounds between hydrogen and helium. In the gas phase at low pressure, i.e., as isolated species, some of these might be stable. Which one of the following species would you predict to be the most stable? He H He H He H He H + 2 σ σ∗ A. [He–H] + B. He–H C. [He–H] D. [He–H] 2– E. None of these species will be stable under any condition.
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e4_131_f08 - CHE 131 Final Exam, Fall 2008 Multiple Choice...

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