Unit 3: Intermolecular Forces and Properties in AP Chemistry examines the forces between molecules and how they influence physical and chemical properties. Key concepts include types of intermolecular forces (dipole-dipole, London dispersion, hydrogen bonding), their relative strengths, and their effects on properties like boiling point, melting point, vapor pressure, and solubility. This unit also covers phase changes and the behavior of liquids and solids, building a comprehensive understanding of matter’s interactions at the molecular level.