Explain the dipole-dipole interaction energy between stationary polar molecules.

Inversely proportional to the third power of the distance between two interacting particles

Dipole-dipole interaction

The energy of dipole-dipole interaction between stationary polar molecules is proportional to 1/ r3, and that between rotating polar molecules is proportional to 1/ r6

where ‘r’ is the distance between polar molecules.

  • The attractive force decreases with the increase of distance between the dipoles.
  • The interaction energy is inversely proportional to the distance between polar molecules.
  • Dipole-dipole interactions occur when the partial charges formed within one molecule are attracted to an opposite partial charge in a nearby molecule.
  • Dipole-dipole interaction can be between polar molecules, such as hydrogen chloride (HCl), carboxylic acids (i.e., acetic acid), and amino acids.

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