:: Forces " stronger " than London dispersion forces that are also van der Waals include Debye forces, Keesom forces, hydrogen bonds, ionic bonds and induced ion forces; see intermolecular force.
2.
These differences can be very small, as in the case of the boiling point of straight-chain alkenes, such as dipole dipole forces ( or Keesom forces ), which add to the London dispersion forces and raise the boiling point.
3.
These positive and negative poles may be a permanent property of a molecule ( Keesom forces ) or a transient effect which can occur in any molecule, as the random movement of electrons within the molecules may result in a temporary concentration of electrons in one region ( London forces ).
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