1. Properties of Water

2. Properties of Water What is the chemical formula for water?
2 Hydrogen atoms and 1 Oxygen atom – H2O

3. Water
The most important molecule to living things.
Why?

4. Water is a polar molecule
This results in a water molecule with a negative end and a positive end.

5. Because water is polar it dissolves many substances.
Water is considered the Universal Solvent, meaning it can dissolve any polar substance.

6. Solubility Review
Solubility - the measure of how much solute can be dissolved by a solvent at a given temperature.
Example: Sugar dissolving in water.
Remember, the sugar dissolves faster in hot water than in cold water.
As the temperature increases,
the solubility increases.

7. Because water is polar it has these properties:
Cohesion- water molecules stick together
Surface tension- inward pull of surface water molecules creating a smooth sheet

8. Because water is polar it has these properties:
Adhesion - water molecules stick to other molecules
Capillary action - allows water to move UP and through materials

9. Specific Heat
Specific Heat - The amount of heat needed to increase the temperature by 1 degree Celsius.
Water has a HIGH Specific Heat!
It takes A LOT OF HEAT to raise the temperature of water.

10. Specific Heat Example
It’s a hot day! The sidewalk is hot, the sandy beach is hot. So, you decide to go to the beach. When you jump in the ocean, the water is surprisingly cool!
Why??? Because it takes more heat to warm the water then the sidewalk, beach and air!

11. Water’s Specific Heat Why does water have a HIGH specific heat?
It’s POLAR!!! (Of course!)
The molecules are SO attracted to each other that it takes A LOT of heat to break the molecules apart.