april 20 chem 11

Intermolecular bonds (bonds between the molecules)

There are three types of bonds:
-London Dispersion Force (L.D.F)
-Dipole-Dipole
-Hydrogen bonds (H-Bonds)

Here is a short summary of each

1.) LDF

- Results from temporary electron dipoles
- Weakest intermolecular force
- Increases as the # e- increases
- Occurs in any compound that has e-, which is everything

2.) Dipole Dipole



-Results from a permanent dipole in molecules
-Polar molecules experience this force
-Polarity depends on the electronegetivity of the element
- The strength of a dipole- dipole bond depends on the difference in electronegativity between the two atoms

3.) Hydrogen bonds
-This is a special type of dipole- dipole bond between H and O, F, or N
- Any molecule that: H-F, H-O or H-N