(Polar molecules, Non-polar molecules, etc.)
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Draw the lewis structure first, if you can identify a dipole (difference in electronegativity between two atoms), it will have dipole dipole interactions and dipole - induced dipole, especially if another molecule that has no dipole is present (induced). If it does not have those properties, then the only force it can have is induced dipole - induced dipole.
To determine the type of intermolecular force present, you look at the the difference in electronegativity between the atoms in a molecule. If the there is a great difference in electronegativity, a dipole-dipole interaction will occur with other polarized molecules or a dipole-induced dipole interaction with another non-polar molecule. If there is not a big difference in electronegativity, then the interaction will be induced-dipole induced-dipole
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