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1 | |
Which of the responses includes all of the following substances that can form hydrogen bonds?
Substances: (1) CH3COCH3; (2) CH3OH; (3) C2H6; (4) HCOOH |
| | A) | compounds 1 and 2 |
| | B) | compounds 1 and 3 |
| | C) | compounds 1, 2, and 3 |
| | D) | compounds 2 and 4 |
| | E) | compounds 1, 2, and 4 |
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2 | |
Samples of which one of the following substances exhibits both dipole-dipole forces and hydrogen bonding? |
| | A) | HCl |
| | B) | PH3 |
| | C) | Br2 |
| | D) | H2 |
| | E) | CH3NH2 |
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3 | |
In which of the following substances are dispersion forces likely to be the most important intermolecular interaction in determining the melting and boiling points? |
| | A) | Br2 |
| | B) | H2S |
| | C) | CO |
| | D) | HCl |
| | E) | ICl |
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4 | |
At a given temperature, which of the following liquids should have the highest viscosity? |
| | A) | CH2Br2 |
| | B) | HOCH2CH2OH |
| | C) | CH2CH2OH |
| | D) | CH3Cl |
| | E) | CH3OCH3 |
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5 | |
Krypton crystallizes in a structure that has four Kr atoms in each unit cell, and the unit cell is a cube. The edge length of the unit cell is 0.559 nm. Calculate the density of crystalline Kr, in kg/m3. |
| | A) | 9.97 x 10-13 kg/m3 |
| | B) | 3.14 x 103 kg/m3 |
| | C) | 3.14 kg/m3 |
| | D) | 3.19 x 103 kg/m3 |
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6 | |
At room temperature, SiO2 is a solid, whereas CO2 is a gas. This is because |
| | A) | both are molecular, but the dispersion forces between SiO2 molecules are stronger because SiO2 is the larger of the two compounds. |
| | B) | both are molecular, but CO2 is linear whereas SiO2 is bent, and therefore has dipole-dipole attractions. |
| | C) | CO2 is molecular, whereas SiO2 is a covalent network solid. |
| | D) | CO2 is molecular whereas SiO2 is ionic. |
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7 | |
Which of the following compounds should have the highest melting point? |
| | A) | MgCl2 |
| | B) | BCl3 |
| | C) | NCl3 |
| | D) | CCl4 |
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8 | |
Which of the following substances would have the greatest electrical conductivity in the solid state? |
| | A) | K |
| | B) | KI |
| | C) | I |
| | D) | IF |
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9 | |
Use the Clausius-Clapeyron equation to estimate the boiling point of water at 24.0 torr pressure. The average (Hvap for water over the relevant temperature range is 42.34 kJ/mol. |
| | A) | 33.2 oC |
| | B) | 25 oC |
| | C) | 298 oC |
| | D) | 80 oC |
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10 | |
Acetic acid has a heat of fusion of 10.8 kJ/mol and a heat of vaporization of 24.3 kJ/mol. The estimated value for the heat of sublimation of acetic acid is |
| | A) | -13.5 kJ/mol. |
| | B) | -35.1 kJ/mol. |
| | C) | 13.5 kJ/mol. |
| | D) | 17.6 kJ/mol. |
| | E) | 35.1 kJ/mol. |
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2002 McGraw-Hill Higher Education