1. Properties of Water

2. 1. Polarity -
Polar molecules have a positive (+) and a negative (-) side. In water, the Hydrogen is positive and the Oxygen is negative.

3. 2. Cohesion -
The positive hydrogens are attracted to the negative oxygen of a neighboring water molecule. The molecules are held together by these Hydrogen bonds.

4. Examples of Cohesion: The shape of raindrops
Water beading up on a newly polished car
The convex surface of water when a container is filled to nearly overflowing
Surface tension – an organism can walk on water if it doesn’t break the hydrogen bonds holding the water molecules together.
(water strider, basilisk)

5. 3. Adhesion -
Because water molecules are polar they stick to other substances. Ex: water sticks to the side of the graduated cylinder forming a meniscus

6. The volume is read from the bottom of the meniscus.

7. 4. Capillarity - This is how water gets from the roots to the leaves.
Water moves up narrow tubes by a combination of adhesion and cohesion.
This is how water gets from the roots to the leaves.