1. Properties of Water Liquid at most temperatures on earth
Expands as it cools
Covers 75% of earth
Makes up 60% of human body cells
Dissolves more things than any other liquid – Universal Solvent
Necessary for chemical reactions in living things
O side is negative and the H side is +.

2. Polar: Has a + and a – side
Breaks apart into charged particles called ions

3. - + Water – H2O H+ and OH- ions are produced when bonds break O
Negative side +
Positive side
H+ and OH- ions are produced when bonds break

4. Water is the Universal Solvent

5. Ex: Kool-aid
Solute is?
Solvent is?

6. Acids vs Bases: pH Acid: Excess of H+ ions in solution
Base: Excess of OH- ions in solution
pH: A scale used to measure how acidic or basic a solution is
(percent H+)

7. pH Scale 7 14 Living things prefer Neutral pH Neutral High H+ Acid7 14
Neutral
High H+ Acid
High OH- Basic
Living things prefer Neutral pH