AP Chemistry Unit Review
Unit 3: Intermolecular Forces and Properties
How it applies to our lives
The difference in intermolecular forces is the reason why oil and water don't mix. Water is polar and has strong hydrogen bonds. Oil is nonpolar and only has weak London dispersion forces. The water molecules hold so tightly together they exclude the nonpolar oil molecules.
Key Vocabulary
Select a card to reveal its definition.
Intermolecular force
Dipole-Dipole
Hydrogen bonding
Ion-Dipole
Polarizability
Ionic solids
Main Takeaways
London Dispersion Forces increase with molecule size due to more polarizable electron clouds.
Gases behave most ideally at low pressure and high temperatures, where interactions and particle volumes are minimized.
Gas laws (Boyle's, Charles's, Gay-Lussac's) describe relationships between P, V, T, and n when other variables are constant.
Lighter molecules move faster at a given temperature than heavier ones, though they share the same average kinetic energy.
Substances with similar polarity and IMFs mix well ('Like dissolves like').
Common Misconceptions
Assuming volume is directly proportional to pressure. It is inversely proportional (Boyle's Law). Doubling volume halves the partial pressure.
Unit Quiz
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