How are hydrogen bonds formed?

Question

I don't need a copied and pasted answer from a Googled site. Please just put it into words that can be easily understood..

Answer 1

To begin there are certain conditions that are required in order for hydrogen bonding to occur.

The hydrogen atom must be bonded to an electronegative atom such as O, F, Cl, N.

Since H is bonded to an electronegative atom, its electrons are pulled towards the electronegative atom.  This produces a deficiency of negative charge around the H atom making it slightly positive.  In turn the electron "pulling" makes the electronegative atom slightly more negative.  This creates a polarity in the molecule, the slightly positive pole of the H atom and the slightly negative pole of the electronegative atom.  

Thus, H bonds form between such molecules when the positive poles attract the negative poles of another molecule.  

Answer 2

You need a hydrogen bonded to an election negative element (especially N, O, F) so that it is carrying a partial positive charge.  This is attracted to highly concentrated lone pairs (positive attracts negative).  That's all there is to it.

Water, the most hydrogen bonded substance that there is, has two hydrogens, and two lone pairs available for hydrogen bonding, on each molecule.  That is why ice adopts an open arrangement, with each water molecule being hydrogen bonded to four others.

HF is a liquid, although HCl is a gas, because of strong hydrogen bonding between the molecules in HF.

Hope this helps.