1. Lesson 2.2: Water Properties

2. Water Molecule Bonding
Hydrogen Bond: The attraction between water molecules

3. Water Molecule Bonding
Polar- Covalent Bond: occurs when the electrons are not shared equally

4. Water Properties
Cohesion: The property of water making it attracted to other water molecules
“Sticks” together

5. Water Properties
Adhesion: is an attraction between molecules of different substances

6. Water Properties
Surface Tension: A property of water causing it to be elastic

7. Water Properties
Capillary Action: The movement of water up through small spaces due to the forces from cohesion, adhesion, and surface tension

8. Water Properties
Heat Capacity: the large amount of heat (energy) required to raise the temperature of the water by 1°C
Water plays a huge role in temperature regulation

9. Water Properties Freezing: water expands when it freezes
Hydrogen bonds become rigid
Freezing point = 0°C

10. Water Properties
Density: ratio of an object’s mass to its volume (D=M/V)
Water is less dense when frozen
This is why ice floats
The heavier an object, the greater the volume for an object to float

11. pH Scale Acids: Lower on the pH scale (0-6)
Neutral: pH = 7
Bases: Higher on the pH scale (8-14)

12. Buffers Buffers: prevent sharp, sudden changes in pH
They play an important role in maintaining homeostasis in organisms
State of equilibrium or stability