Question

Van der Waals interactions result when

Answer 1

These interactions can be temporary when a non-polar molecule's electrons accumulate temporarily on one side of the molecule. This creates a positiveand negative charge on the molecule and the attractive force between molecules resulting from this are a type of Van der Waals force called London dispersion forces.

Answer 2

The van der Waals constant 'a' represents the magnitude of intermolecular forces of attraction and the Van der Waals constant 'b' represents the effective size of the molecules.