Question

Explain how dipole interactions and dispersion forces are related. first, explain what produces the attractions between polar molecules. then, explain what produces dispersion forces between molecules. which intermolecular force is stronger?

Answer 1

One end of the polar molecule is slightly negative and the other end is slightly positive and that's what produces the attraction between the polar molecules. The weakest of all molecular interactions are caused by the motion of electrons and that is what produces dispersion between molecules

Answer 2

Explanation:

Polar molecules have an unbalanced distribution of electrons in the molecule due to the differences of electronegativities of its atoms. This creates a negative pole and a positive pole.

The interactions between opposite poles (negative with positive) creates the attraction forces in the polar molecules (in addition to the London forces),

On the other hand, the interactions between equal poles (positive-positive or negative-negative) creates the dispersion forces in the molecules.

Polar molecules can also have Hydrogen bonds if the have H atoms bonded to O, N or F.

Intermolecular forces in decreasing strengh order:

Hydrogen bond > Dipole-dipole > London