In polar molecules, there is an overall separation in charges. An important aspect in determining whether a molecule is polar or non-polar is to look at its diagram and see if there is any symmetry. If a molecule is unsymmetrical, it is usually polar and if it is symmetrical, it would usually be non-polar. If one was to figure out that the molecule was non-polar, that would mean that the pull of the electrons is usually balanced. After determining if a molecule is polar, that would mean that the molecule has either different atoms or a different amount of atoms. One would then use signs to show which side is partially positive or partially negative.
EX.1:
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