Question 10.3: IDENTIFYING INTERMOLECULAR FORCES Identify the likely kinds ...
IDENTIFYING INTERMOLECULAR FORCES
Identify the likely kinds of intermolecular forces in the following substances:
(a) HCl (b) CH_{3}CH_{3} (c) CH_{3}NH_{2} (d) Kr
STRATEGY
Look at the structure of each substance, and decide what intermolecular forces are present. 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.