Properties of Water What can water do 1

Properties of Water What can water do?

1. Cohesion • When water is attracted to (or bonds to) other molecules of water. • Example: drops of water.

2. Adhesion • When water is attracted to (or bonds to) other types of molecules. • Example: water bonding to a leaf.

3. Surface Tension • Water molecules at the surface are closer together and form a membrane/film. • Example: Some insects can walk on water because of this “film. ”

4. Specific Heat • The amount of energy needed to raise the temperature of a substance by 1°. • Water has a high specific heat, so it takes a lot of energy to change its temperature. • Example: This helps give ecosystems and organisms a pretty constant temperature.

5. Polarity • The symbol for this polar molecule is H 2 O. • Electrons are not equally shared: – The hydrogen side - POSITIVE charge. – The oxygen side - NEGATIVE charge. • A water molecule is held together with “hydrogen” bonds between the O and H’s. • Polarity is responsible for both cohesion AND adhesion.

6. Universal Solvent • Because of its polarity, water is the “universal solvent” – it can dissolve many different substances. • Example: Sugar is soluble and dissolves in water.

Find & explain the two puns!

7. Density • D = m (Amount of mass per v unit of volume. ) • A measure of how closely packed together molecules are. • Frozen water (ice) is less dense, so it floats on top of liquid water. Water ecosystems are protected in cold temperatures so they don’t freeze solid.

8. Buoyancy • The force of water pushing up against objects. • This force allows fish or other objects to float in water.

360 Video • Properties of water! • http: //www. learn 360. com/Show. Video. aspx? S earch. Text=properties+of+water&lid=1856588 4&ID=147976