9. Define a hydrogen bond.

A hydrogen bond forms when a hydrogen is attached to a larger atom such as nitrogen and oxygen. The hydrogen's electron which bind them together with other atoms are weakly pulled toward the larger atoms. This results in the larger atom gaining a weak negative charge and the hydrogen gaining a weak positive charge. This weak positive of the hydrogen will attract other weakly negatively charged atoms of oxygen and nitrogen. This will result in complex multiple bonding in large organic molecules.