# How does the interaction of polar covalent bonds allow hydrogen bonds to form?

Aug 8, 2017

When hydrogen is bound to a ..........

#### Explanation:

When hydrogen is bound to a strongly electronegative element, i.e. $O , N , F$, charge separation occurs as the heteroatom polarizes electron density from the bond to acquire a partially negative charge. And of course if the charge is partially negative, there must be a partial positive charge developed on the hydrogen.

And thus a molecular dipole is generated, and in the bulk solution the dipoles line up to given an extra, potent intermolecular force that is known as $\text{hydrogen bonding}$.

For hydrogen fluoride, we could represent this interaction as $\stackrel{\delta +}{H} - \stackrel{\delta -}{F}$ $\cdots \stackrel{\delta +}{H} - \stackrel{\delta -}{F} \cdots \stackrel{\delta +}{H} -$