What are weak chemical bonds that form between polar molecules called?

May 22, 2016

dipole-dipole interaction

Explanation:

polar molecules are characterized by their net dipole moment resulting from the pull of electron density by an electronegative element from a less electronegative one.

For example, in a carbonyl group $C = O$ of acetone, the oxygen pulls the electron density toward it resulting in a partial negative charge ($\delta -$) on oxygen and a partial positive charge ($\delta +$) on carbon:

the attraction between the $\delta -$ on oxygen from one molecule and the $\delta +$ on carbon from another molecule will result in a dipole-dipole interaction between the two molecules: