(Polar molecules, Non-polar molecules, etc.)
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The dipole charge has to do with electronegativity. The more electronegative atom has a partial negative charge since it pulls the electrons closer to itself. While, the less electronegative atom is partially positive since the other atom is holding the electrons more tightly.
So for example, in C2H2Cl2, C is bonded to Cl. The Cl would be more negative because it has a higher electronegativity, it wants electrons more than the C. Thus, the C would be more positive. These are the positive and negative dipole moments.
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