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What are dipole-dipole moments?
How do dipole-dipole moments affect the properties of a substance?
Well, substances with strong dipole-dipole forces tend to have higher melting and boiling points, as well as higher surface tension and viscosity. They also tend to dissolve in polar solvents but not nonpolar solvents. Meanwhile, substances with weaker dipole-dipole forces have lower melting and boiling points, and tend to be more soluble in nonpolar solvents.