Chemical polarity refers to the dipole-dipole intermolecular forces between the slightly positively-charged end of one molecule to the negative end of another or the same molecule. Molecular polarity is dependent on the difference in electronegativity between atoms in a compound and the asymmetry of the compound's structure. For example, water is polar because of the unequal sharing of its electrons. However, methane is considered non-polar because the carbon shares the hydrogen molecules uniformally.