Question 8.8: Identifying Intermolecular Forces Identify the kinds of inte...
Identifying Intermolecular Forces
Identify the kinds of intermolecular forces in the following substances:
(a) HCl (b) CH_{3}CH_{3} (ethane)
(c) CH_{3}NH_{2} (methylamine) (d) Kr
STRATEGY
Determine the structure of each substance, and decide what intermolecular forces are present. Remember: All molecules have dispersion forces; polar molecules have dipole–dipole forces; and molecules with O-H, N-H, or F-H bonds have hydrogen bonds.
(a) HCl is a polar molecule but can’t form hydrogen bonds. It has dipole–dipole forces and dispersion forces.
(b) CH_{3}CH_{3} is a nonpolar molecule and has only dispersion forces.
(c) CH_{3}NH_{2} is a polar molecule that can form hydrogen bonds. In addition, it has dipole–dipole forces and dispersion forces.
(d) Kr is nonpolar and has only dispersion forces.