London/dispersion/van der Waals forces - these are weak interactions that occur in a matter of nanoseconds when one atom in a bond temporarily takes more of the electron density than the other one, causing a temporary dipole - i.e. this can happen even when you have a C-H bond that is normally nonpolar. Solution London/dispersion/van der Waals forces - these are weak interactions that occur in a matter of nanoseconds when one atom in a bond temporarily takes more of the electron density than the other one, causing a temporary dipole - i.e. this can happen even when you have a C-H bond that is normally nonpolar..