(Polar molecules, Non-polar molecules, etc.)
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^The above procedure determines if the molecule as a whole is polar or not. To answer your question about determining if an individual bond is polar, you have to look at the electronegativity of each element in the bond. If there is a difference in electronegativity, there is a "dipole moment", which is indicated by an arrow pointed to the more electronegative element (so a bond between 2 atoms of the same element will be a nonpolar bond since there is no difference in electronegativity). If dipole moments are arranged in a geometry such that they "cancel each other out", the molecule is nonpolar but with polar bonds; if the dipole moments don't cancel each other out, it is a polar molecule.