Dipole-dipole forces are attractive forces between the positive end of one polar molecule and the negative end of another polar molecule. Dipole-dipole forces have strengths that range from 5 kJ to 20 kJ per mole. They are much weaker than ionic or covalent bonds and have a significant effect only when the molecules involved are close together (touching or almost touching).
The figures show two arrangements of polar iodine monochloride (ICl) molecules that give rise to dipole-dipole attractions.
A dashed line is used to represent an intermolecular attraction between molecules because these forces are NOT as strong as chemical bonds.
|One arrangement of ICl molecules that gives rise to a dipole-dipole attraction.||Another arrangement of ICl molecules that gives rise to a dipole-dipole attraction.|
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