1. Water, A Polar Molecule
Moretz, 2012
Biology

2. Water Most abundant compound in living things.
Liquid on most of Earth’s surface.
Expands when it freezes.

3. Water Water has a total charge of ZERO
(10 neutrons + 10 protons + 10 electrons = no charge)
Water is POLAR = charges are not evenly distributed throughout molecule.

4. Water & Polarity POLARITY:
Oxygen has a slight negative charge in water.
Hydrogen has a slight positive charge in water.

5. Hydrogen Bonds Intermolecular force between polar molecules. Ex.

6. Hydrogen Bonds Worksheet
Label the positively charged region in water and the negatively charged region in water.
Draw another water molecule near the original water molecule. Be sure to orient the water molecule correctly.
Add 3 more water molecules.

7. Hydrogen Bonds 7 water molecules 7 oxygens 14 hydrogens

8. Properties of Water Cohesion
Attraction between a water molecule and other water molecules.
Surface tension – cohesion causes water molecules on the surface of water to be drawn inward.

9. Cohesion

10. Surface Tension

11. Properties of Water Adhesion
Attraction between water molecules and other substances.
Capillary action – adhesion causes water to rise up in a narrow tube.

12. Capillary Action