1. Properties of Water Essential Standard
Bio.4.1 Understanding how biological molecules are essential to the survival of living organisms.

2. Water
Chemical reactions of living things take place in aqueous environment
Many unique properties

3. 1. Polarity Polarity - sharing of atoms unequally
Water shares hydrogen atoms unevenly
Oxygen atom is negatively charged
Polar substances dissolve in polar substances (water)
Nonpolar – sharing of atoms equally
Nonpolar substances do not dissolve in water

4. 2. Hydrogen Bonding
Hydrogen bonds – weak bonds between hydrogen of one molecule and oxygen of another molecule

5. 3. Attractive Forces Cohesion – attraction between like substances
Creates surface tension
Adhesion – attraction between unlike substances
Capillarity – ability of substance to draw another substance into it

6. 4. Temperature Moderation
Temperature does not experience significant change until after hydrogen bonds break
Requires lots of heat!