Chemistry (Chang), 10th Edition

Chapter 11: Intermolecular Forces and Liquids and Solids

Self Assessment A

1
Argon atoms do not combine to form species such as Ar2, yet argon atoms do attract one another weakly through:
A)dipole-dipole forces
B)dipole-induced dipole forces
C)ion-dipole forces
D)dispersion forces
E)hydrogen bonding
2
Which of the following substances is not likely to exhibit hydrogen bonding?
A)CH3CH2OH
B)CH3NH2
C)HOCH2CH2OH
D)(CH3)3N
E)NH2OH
3
Which of the following liquids would have the highest viscosity at 25oC?
A)HOCH2CH2OH
B)CH3CH2OH
C)CH3CH2Cl
D)CH3COOCH3
E)CH3CH2OCH2CH3
4
Lithium metal has a body-centered cubic unit cell. How many lithium atoms are there in one unit cell?
A)1
B)2
C)3
D)4
E)8
5
Osmium tetraoxide, OsO4 is a molecular crystal. Which of the following general properties would you NOT expect it to possess:
A)being a poor conductor of electricity
B)having soft rather than brittle crystals
C)having a melting point around 40oC
D)having a melting point around 1600oC
6
Which of the following substances should have the highest heat of vaporization?
A)H2O
B)H2S
C)C6H6
D)CH3OH
E)CH3OCH3
7
Which of the following gases would have the highest critical temperature?
A)NH3
B)CH3OH
C)H2
D)C6H6
E)H2O
8
How much energy (heat) is required to convert 248 g of water from 0oC to 154oC? Assume that the water begins as a liquid, that the specific heat of water is 4.184 J/g.oC over the entire liquid range, that the specific heat of steam is 1.99 J/g.oC, and the heat of vaporization of water is 40.79 kJ/mol.
A)562 kJ
B)130 kJ
C)692 kJ
D)589 kJ
E)639 kJ
9
Diethyl ether has a heat of fusion of 6.90 kJ/mol and a heat of vaporization of 26.0 kJ/mol. Estimate the heat of sublimation of diethyl ether.
A)-32.9 kJ/mol
B)+32.9 kJ/mol
C)-19.1 kJ/mol
D)+19.1 kJ/mol
E)The heat of sublimation can't be estimated from the data given.
10
Between 20 and 80oC, the enthalpy of vaporization of benzene is 31.0 kJ/mol. At 26oC, the vapor pressure of benzene is 100 torr. Calculate the vapor pressure of benzene at 45oC. R = 8.314 J/K·mol.
A)18.1 torr
B)633 torr
C)47.6 torr
D)211 torr
E)None of the above
11
Which of the following in incorrectly paired?
A)ionic crystals; cesium chloride
B)covalent crystals; diamond
C)molecular crystals; ice; sucrose
D)metallic crystals; sodium chloride
12
Which substance would have the higher normal boiling point?
A)CH4
B)SiH4
13
If the atomic radius of a calcium crystal is 180 pm, what is the length of the edge of the unit cell?
A)509 pm
B)552 pm
C)600 pm
D)624 pm
14
Naphthalene sublimes at room temperature and 1 atmosphere pressure; which statement is true concerning the triple point of naphthalene?
A)The triple point is lower than room temperature.
B)The triple point is higher than room temperature.
C)The triple point is equal to room temperature.
15
Which of the following statements is false?
A)Phase change; energy (heat) is removed or added.
B)Amorphous solids; lack a regular three-dimensional atomic arrangement.
C)Molar heat of vaporization; energy required to vaporize one mole of a liquid.
D)Critical temperature; regardless of the amount of pressure applied, the substance is a gas.
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