# What kind of bond is created by a weak electrical attraction between polar molecules?

Aug 16, 2017

This would be called the dipole-dipole interaction.

#### Explanation:

The predominant intermolecular force between two polar molecules (unless it can undergo the stronger hydrogen bond) is the dipole-dipole interaction.

This type of force occurs between the positive end of one molecule and the negative end of another molecule:

In this image, the slightly positive hydrogen end (slightly positive because it has a lower electronegativity than $\text{Cl}$) is electrically attracted to the slightly negative chlorine end (slightly negative because it is more electronegative than $\text{H}$, which means electron density will be more concentrated toward $\text{Cl}$).

If the more electronegative atom (that is bonded to $\text{H}$) is $\text{N}$, $\text{O}$, or $\text{F}$ (the nonmetals with the highest electronegativity), then the force is known as hydrogen bonding, which is stronger than dipole-dipole forces.

An example of this hydrogen bonding is seen in plain old water molecules: