Intermolecular Forces and Properties Overview — AP Chemistry
1. Unit at a Glance
This unit is organized to build from foundational classification of states of matter, to the intermolecular forces that hold matter together, to behavior of gases, then to properties of mixtures and solutions. We move from observable macroscopic properties to the particulate-level explanations that the AP Chemistry exam heavily emphasizes.
Intermolecular forces are the unifying theme of this unit: every physical property we study (boiling point, solubility, pressure, viscosity) traces back to the strength and type of interactions between particles.
Common Pitfalls
Why: Intermolecular forces act between separate molecules, while intramolecular bonds hold atoms together within a molecule. This is a common AP exam trap.
Why: Ideal gas law assumes no intermolecular forces and zero molecular volume, which is only true at low pressure and high temperature
Why: The 'like dissolves like' rule is rooted in intermolecular interactions between solute and solvent