CLEAR & SIMPLE What is the difference between polar and nonpolar molecules? Check out this video on Molecular Polarity which makes this EASY. Polar and Non Polar Covalent Molecules This video explains how to determine if a molecule is polar or non polar. I show you how, based on symmetry alone, a molecule can be determined to polar or non polar. Although I show you the shapes of the molecules, it is important for you to be able to classify the shapes according to the VSEPR Theory, so please learn your shapes. The degree of polarity can be determine to a certain extent by the differences in electronegativity, but I don't cover that in this video. Best wishes in learning.