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Dipole moments result from differences in electronegativity. When the differences in electronegativity fail to cancel out (point in opposite directions) then the electronegativity difference in the molecule creates a dipole moment. CCl4 is nonpolar and does not have a dipole moment because each of the C-Cl bonds cancels each other out. H2O is polar and has a dipole moment due to its bent shape, which causes the H-O bonds to point away from the lone pair of electrons on oxygen, and creates an electronegativity difference and a dipole moment.
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