AP Chemistry / Unit 3: Properties of Substances and Mixtures
3.1 Intermolecular and Interparticle Forces
Notes
- London dispersion: in all molecules; stronger with more electrons (bigger, more polarizable).
- Dipole-dipole: between polar molecules.
- Hydrogen bonding: H bonded to N, O or F attracted to a lone pair on N, O or F.
- Ion-dipole: ions with polar molecules (salt in water).
Practice
The strongest IMF between water molecules:
H on O.
Which has the highest boiling point?
Most electrons, strongest dispersion.
Which can hydrogen bond?
H bonded to N.
Ready for more? Take the Unit 3 test.