Chem1405 homework chap6
1. In which of the following phases of matter do the particles have virtually no
interaction with one another? (Section 6.1)
a. gas
b. liquid
c. solid
2. Which of the following statements about London forces is true? (Section 6.2)
a. London forces occur between polar bonds.
b. London forces are the strongest intermolecular force.
c. London forces are transient.
3.
a.
b.
c.
Which of the following statements about CCl2F2 is correct? (Section 6.2)
Although the bonds are polar, the molecule is nonpolar.
The bonds are polar and the molecule is polar.
The bonds are nonpolar and the molecule is nonpolar.
4. Which of the following examples shows the secondary forces in increasing strength?
(Sections 6.1-6.3)
a. London forces < dipole-dipole < hydrogen bond
b. hydrogen bond < dipole-dipole < London force
c. dipole-dipole < hydrogen bond < London force
5. Arrange the molecules H2O, CH4, and CH3F order of increasing boiling point.
(Section 6.4)
a. H2O < CH4 < CH3F
b. CH3F < CH4 < H2O
c. CH4 < CH3F < H2O
6. Which of the molecules, H2O or CCl4, would have a higher heat of vaporization?
(Sections 6.1-6.4)
a. H2O
b. CCl4
c. The two molecules would have similar heats of vaporization.
7. Which of the following statements about vapor pressure is NOT true? (Section 6.7)
a. The smaller the attractive forces between molecules, the greater the vapor pressure.
b. When the vapor pressure of a liquid is equal to the atmospheric pressure, a liquid will
boil.
c. The higher a liquid is above sea level, the greater the temperature required for the
liquid to boil.
8. In which type of crystal are the attractive forces between molecules the strongest?
(Section 6.9)
a. covalent
b. ionic
c. molecular
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