What are dipole-dipole forces?

1 Answer
May 29, 2014

Answer:

Dipole-dipole forces are the attraction between the positive end of one molecule and the negative end of another.

Explanation:

Dipoles form when there is a large difference in electronegativity between two atoms joined by a covalent bond.

The atoms share the electrons unequally because the more electronegative atom pulls the shared electrons toward itself.

That means that one atom has a partial negative charge, and the other atom has a partial negative charge.

For example, H-Cl has a dipole. The electrons spend more of their time near the Cl atom (the red end in the diagram below).

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A dipole-dipole interaction is the attraction between two polar molecules. When they approach each other, the negative end one molecule attracts the positive end of the other.

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The molecules arrange themselves to increase their attraction and reduce their potential energy.

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