0

Im confused. How to relate permanent dipole dipole moment, temporary dipole induced dipole and Van der waals forces of attractrion?

Anonymous
  • 111
  • You can setup a perturbative expansion to include all these dipoles, except covalent bonding. – Rodriguez May 28 '16 at 19:23
  • 1
    Induced dipoles are much like credit money: you can buy goods and use them all right, but still they are not quite yours. – Ivan Neretin May 28 '16 at 19:56
  • permanent dipole dipole is like a water molecule. temporary dipole is a transient feature that appears to relax the systems energy, Van der waals are a consequence of induced dipoles in larger molecules with more freedom. – Jordan Epstein May 28 '16 at 21:39

1 Answers1

2

Permanent dipoles are the result of charge separation within a bond, and normally results from bonds where the two elements have a large difference in electronegativity. Dipole moment is a measurement of the polarity of a compound. For example, the carbon-oxygen bond in acetone gives the compound a permanent dipole, explaining its large dipole moment. A temporary dipole occurs when electrons randomly group together in one part of a bond. These dipoles result in London Dispersion Forces, the weakest king of Van der Waals force. Van der Waals forces are a collective term for all residual attractive and repulsive forces between compounds that are not the result of ionic or covalent interactions. Induced dipoles are dipoles that result from a non polar compound becoming polarized as a result of interactions with an ion or polar compound.

Niels Kornerup
  • 2,338
  • 1
  • 13
  • 31