1. Properties of Water

2. Water Water is one of the most important molecules to life
In fact, when scientists are trying to determine if a planet could support life, they try to find water on that planet

3. Polarity Many of water’s properties stem from its structure
Water has a definite structure of H20
Many people call it a “Mickey Mouse”

4. Polarity
The structure of water has an ability to affect other water molecules
Because of the position of the molecules, water has slightly uneven charges
Polarity is the term given to molecules that have uneven distribution to their charges

5. Polarity
The oxygen atom in water has a greater attraction to electrons
This means that the electrons are slightly more attracted to the oxygen
The hydrogen atoms have a lesser attraction to their electrons
This means that the electrons are farther away from the hydrogen

6. Polarity
Because of how the electrons are pulled, the water atom has uneven charges
Since the electrons are more attracted to the oxygen, it has a slightly negative charge
Since the electrons are farther away from the hydrogen it has a slightly positive charge

7. Hydrogen Bonding
Since water is polar and it has slight negative and positive charges it has a special structure
The nature of the uneven charges causes the slightly negative charges to be attracted to the slightly positive charges

8. Hydrogen Bonding
When water molecules are attracted to each other, it is called Hydrogen Bonding
Hydrogen Bonding is when a hydrogen atom is attracted to the partial charge of another polar molecule

9. Cohesion and Adhesion
Water molecules will stick to each other due to their hydrogen bonds
Think of your shower, what do the walls look like after you use it?
How do you remove the water from the shower after you use it?

10. Cohesion and Adhesion
Cohesion is the process of water sticking to itself due to its polar bonds
It will cause water to tend to stick to itself

11. Cohesion and Adhesion Surface Tension is a property of cohesion
It causes the surface of the water to be pulled towards the remainder of the water
The water forms a slight “skin” that pulls back towards the rest of the water

12. Cohesion and Adhesion
Adhesion is the attraction between two different kinds of molecules
Water will often be attracted to different materials because of its structure

13. Cohesion and Adhesion
With both the processes of cohesion and adhesion, water climbs up small tubes
Why do you think water climbs up small tubes?
This process is called Capillary Action

14. Demo

15. Temperature
Since water is a polar molecule, it is very attracted to other water molecules
It does not want to be pulled away from other water molecules
It takes A LOT of energy to move water molecules away from each other

16. Temperature Water does not often change its temperature
It takes a lot of heat to break the hydrogen bonds of water
Breaking the bonds would allow water molecules to move away from each other