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Dipole-dipole interactions occur between two molecules that already have dipole moments, such as an interaction between 2 HF molecules. In the case of dipole induced dipole, a molecule with a dipole moment will induce a dipole moment in another atom without a dipole moment by distorting its electron cloud.
Dipole-dipole interactions occur between molecules that have permanent dipoles. Induced dipole interactions occur when a molecule with a permanent dipole causes another molecule to have a dipole moment by distorting its electron cloud and thus giving it an uneven charge distribution, with one area being more positive and another being more negative because of this shift of electrons. A molecule with a dipole will cause another molecule to have slightly positive and slightly negative areas because of its dipole. The molecule with a permanent dipole will have another molecule's electrons attracted to its positive end. By attracting that molecule's electrons, a positive region will develop because of the shifting of the electron cloud and thereby lack of electrons.
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