Intermolecular Forces and Physical Properties (5B) Practice Test

Acetone evaporates slowest because it forms stronger hydrogen bonds than water due to its carbonyl group.

Pentane evaporates fastest because it has weaker intermolecular attractions (primarily dispersion forces) than the hydrogen bonding in water and dipoleaddipole interactions in acetone.

Water evaporates slowest because it is nonpolar and therefore experiences the strongest dispersion forces.

Pentane evaporates fastest because its CafC covalent bonds break more easily than OafH bonds, allowing molecules to escape.