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You know electronegativity trends from the periodic table, so unless you want the exact numerical value, you can just follow the trend. The larger the difference in electronegativity, the larger the dipole moment. Polar molecules have permanent dipole moments, and nonpolar molecules can have induced dipole moments.
Katherine Brenner 3H wrote:Can an individual molecule be dipole- dipole. Or would we just say that this is a dipole moment within 1 molecule?
An individual molecule will only have a dipole moment. Dipole-dipole interaction can only occur between two molecules. This is because dipole-dipole is an intermolecular force, not an intermolecular force.
Dipole-Dipole is a describing two molecules, each with an individual dipole, interacting. Thus it is an intermolecular force. A dipole itself is a separation of charge in a molecule, resulting from an uneven distribution of electrons.
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