Intermolecular Bonds

Are: - Bonds between molecules
- There are three types



1) London Dispersion Force (L.D.F)
- weakest intermolecular force
-results in temporary electron dipoles
- increases as number of electrons increase
- occurs in any compund that has electrons (everything)

eg: Br has a higher L.D.F. than Cl

2) Dipole-Dipole Force
- results from a permanent dipole in molecules
- polar molecules experience this force
- polarity depends on how much an element wants electrons (electronegativity)
- strength of a dipole-dipole bond depends on the difference in electronegativity between 2 atoms

3) Hydrogen Bonds (H-Bonds)
- this is a special type of dipole-dipole bond between H and O, F or N
- Any molecule that has H-F, O-O, H-O or H-N

Diople-Diople Force Diagram

Short Video Clips

http://http//www.youtube.com/watch?v=3t1Jn_jrsQk&feature=related

http://www.youtube.com/watch?v=lkl5cbfqFRM&feature=related