Wednesday, February 15, 2012

Hydrogen Bonds

The electrical attraction between the hydrogen atom in a polar bond in one molecule and an oxygen or nitrogen atom in a polar bond of another molecule forms a hydrogen bond. This type of bond is very weak, having only about 4 percent of the strength of the polar bonds linking the hydrogen and oxygen within a single water molecule (H2O). Hydrogen bonds are represented in diagrams by dashed or dotted lines to distinguish them from covalent bonds. Hydrogen bonds between and within molecules play an important role in molecular interactions and in determining the shape of large molecules.