chem 11: summary of intermolecular forces

london forces

found in all molecules

dipole-dipole forces

found only in polar molecules

hydrogen bonds

found only in molecules containing hydrogen covalently bonded to highly electronegative atoms

london forces

very weak

dipole-dipole forces

fairly strong

hydrogen bonds

very strong

london forces

momentary attraction between weak partial charges

dipole-dipole forces

constant attraction between weak partial charges

hydrogen bonds

constant attraction between strong partial charges; includes some sharing of electrons