Water and Ice

Outline1. Introduction  2. The Hydrogen Bond  3. Tetrahedral Geometry4. Ice5. Water6. Melting

Water

Let's look at a representative “drop” of water made from 30 H2O molecules.

stick model and examine the geometry of the hydrogen bonds carefully. About half of the hydrogen bonds have non-ideal orientations.

In a given set of hydrogen bonds, the strongest hydrogen bonds are those closest to perfect geometry. While hydrogen bonds that are longer than normal are definitely weaker, those with bond lengths shorter than normal are not necessarily stronger. Find several strong and very weak hydrogen bonds.