practice exam

practice exam - .INTACTBLOCK {page-break-inside: avoid ;}...

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.INTACTBLOCK {page-break-inside: avoid ;} .INTACTBLOCKR {page-break-inside: avoid ;} Midterm II B Created: 9:39:11 AM PST Student: _________________________________________________________ 1. In the packing of identical atoms with cubic unit cells, the packing efficiency increases as the coordination number increases. True False 2. Helical segments of protein molecules arise through hydrogen bonding between C=O and N-H groups. True False 3. A flask containing neon gas is connected to an open-ended mercury manometer. The open end is exposed to the atmosphere, where the prevailing pressure is 745 torr. The mercury level in the open arm is 50. mm below that in the arm connected to the flask of neon. What is the neon pressure, in torr? A. -50. torr B. 50. torr C. 695 torr D. 795 torr E. none of these choices is correct 4. Ammonia's unusually high melting point is the result of A. dipole-dipole forces. B. London dispersion forces. C. hydrogen bonding. D. covalent bonding. E. ionic bonding. 5. In which of the following compounds will the molecules not form hydrogen bonds with each other? A. a
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B. b C. c D. d E. e 6. Which of the following pairs of ions is arranged so that the ion with the smaller charge density is listed first? A. K + , Rb + B. Cl - , K + C. Cl - , Br - D. Ca 2+ , Ba 2+ E. None of these pairs are arranged in this way. 7. Calcium nitrite is used as a corrosion inhibitor in lubricants. What is the molality of a solution prepared by dissolving 18.5 g of calcium nitrite in 83.5 g of distilled water? A. 0.0342 m B. 0.0855 m C. 0.222 m D. 0.444 m E. 1.68 m 8. Arrange the following gases in order of increasing rate of effusion. C 2 H 6 Ar HCl PH 3 A. Ar < HCl <PH 3 < C 2 H 6 B. C 2 H 6 < PH 3 < HCl < Ar C. Ar < PH 3 < C 2 H 6 < HCl D. C 2 H 6 < HCl < PH 3 < Ar E. Ar <PH 3 < HCl < C 2 H 6 9. A gas mixture consists of equal masses of methane (molecular weight 16.0) and argon (atomic weight 40.0). If the partial pressure of argon is 200. torr, what is the pressure of methane, in torr? A. 80.0 torr B. 200. torr C. 256 torr D. 500. torr E. 556 torr 10. The coordination number of sodium and chloride ions in the NaCl lattice, are, respectively: A. 10 and 10 B. 8 and 8 C. 6 and 6 D. 4 and 4 E. none of these choices is correct 11. Which of the following liquids is likely to have the highest surface tension? A. Br 2 B. C 8 H 18 C. CH 3 OCH 3 D. CH 3 OH E. Pb 12. When the electron cloud of a molecule is easily distorted, the molecule has a high _____________.
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A. polarity B. polarizability C. dipole moment D. van der Waals radius E. compressibility 13. Which one of the following substances does not exist in the indicated solid type? A.
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practice exam - .INTACTBLOCK {page-break-inside: avoid ;}...

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