Question

differentiate between polar and nonpolar substances

Answer 1

$\underline{\bold{Non\: polar\: substances}}$

The substances in the molecules of those, the centre of mass of the positive charge and negative charge coincide are known as non-polar substances. the substances don't process any permanent dipole moment.

$\underline{\bold{Polar\: substances}}$

the molecules in those the centre of mass of positive charge and negative charge are separated (do not coincide) are called as polar molecules. They have their permanent dipole moment.

$\underline{\bold{ Polarization}}$

The process of stretching a molecule in the electric field so as it posses it's a temporary dipole moment is called polarization.