CHM115 Review questions Oct 09

CHM115 Review questions Oct 09 - Multiple Choice Review...

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Multiple Choice Review Questions CHM11500 Fa09 For questions 1 – 6, refer to the structure of Capscaicin. This is the molecule that makes hot peppers hot! iv 1. What is the highest bond order present in the molecule? (a) 0 (b) 1 (c) 2 (d) 3 (e) 4 2. Consider the bonds labeled i, ii, and iii. Which of the following correctly ranks those bonds in order from shortest to longest ? (a) i < ii < iii (b) ii < iii < i (c) iii < i < ii (d) i < iii < ii (e) iii < ii < i 3. Which of the following is a resonance structure of the Capscaicin shown above? (a) HO O N O H (b) HO O N O H (c) HO O N OH (d) HO O N O H (e) HO O N O H 1 i v iii A ii
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4. What is the C - O - C bond angle about the oxygen labeled A ? (a) Less than 109.5º (b) 109.5º (c) Greater than 109.5º but less than 120º (d) 120º (e) Greater than 120º 5. Consider the bonds labeled iv and v. Which of the following statements is true ? (a) v has a larger bond energy and has a higher vibrational frequency than iv. (b) v has a larger bond energy than iv, and they have the same vibrational frequency. (c) v has a smaller bond energy and has a lower vibrational frequency than iv. (d) v and iv have the same bond energy, and v has a lower vibrational frequency. (e) v has a smaller bond energy and a higher vibrational frequency than iv. 6. Which of the following functional groups is not present in Capscaicin? (a) hydroxyl (b) carbonyl (c) carboxylic acid (d) All of these groups are present in Capscaicin (e) None of these groups are present in Capscaicin 7. In laboratory 3, “From element to salt”, what would have happened if the mixture of the strong base and aluminum was heated too quickly and it spattered? (a) There would be incomplete conversion of Al to alum (b) The % yield of alum would be low (c) It would require more H 2 SO 4 to form the alum (d) A and B (e) A, B, and C 8. Which salt has the smallest (least negative) lattice energy? (a) KCl (b) KI (c) CaS (d) NaBr (e) LiBr 2
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9. Refer to the plot below for a diatomic molecule A-B Which of the following statements correctly describes the molecule when the internuclear distance is at the position marked by the (a) At the , the atoms are not bonded to each other.
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CHM115 Review questions Oct 09 - Multiple Choice Review...

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