1. WARM UP
List the 7 types of intermolecular forces, and briefly describe each.

2. Intermolecular Forces
Chemistry II

3. IMF Overview Force between + and – of molecules
Weaker than bonds
Stronger as polarity increases
Studied by Johannes vanderWaals and Fritz London

4. Ion – Ion
Ions in crystals

5. Dipole – Dipole
Polar molecule ends

6. Dipole – Dipole Hydrogen bonds Very strong dipole-dipole
H bonded to O, N, or F
Water

7. Ion – Dipole
Ion and polar molecule
Salt water

8. Polarizability
Ability of a nonpolar atom to become a temporary, weak dipole
More e- = higher polarizability = more charge

9. Ion – Induced Dipole
Ion and nonpolar

10. Dipole – Induced Dipole
Polar and nonpolar

11. Dispersion
Two nonpolars
Random e- movement creates temporary dipoles

12. WRAP UP
Which of the following should have the strongest intermolecular forces?
a. CH4 b. Cl2 c. CO d. CS2