1. Agenda Learning Goal: Essential Question?
What properties of water make it so important?
Notes on Properties of Water
Properties of Water Exit Ticket end of class)
Learning Goal:
I will be able to
Describe the special properties of water and explain its importance.
Explain the formation of hydrogen bonds

2. Properties of Water!!!

3. Water & Its Importance
Why is water important for our bodies?
Water makes up 70 to 95 percent of most organisms.

4. Water Characteristics
Important vocabulary to remember:
Polarity
Adhesion
Evaporation
Surface Tension
Cohesion
Hydrogen Bond
Condensation

5. States of Matter
Kinetic Theory of Matter states that all matter is made up of particles that are in constant motion.
States of matter are determined by 3 factors:
Particle arrangement
Energy of the particles
Distance of the particles

6. Solids
Solids – - the particles of solids are tightly packed, vibrating about a fixed position. - solids have a definite shape and definite volume What happens to the particles when you add heat??

7. Liquids
Liquids -
- The particles of liquids are close together but do not have a regular arrangement.
- Liquids have an indefinite shape but a definite volume.

8. Gases
Gases -
- The particles of gases are widely spaced and have no regular arrangement.
- Gases have an indefinite shape and an indefinite volume.

9. Properties of Ice Ice is created whenever water freezes.
Whenever temp reaches 0 C or 32 F, water freezes into a crystal and the particles begin to expand.
As the particles expand, the density decreases.

10. Why is it good that ice floats?
If ice was more dense than water, the ice would sink to the bottom.
This process would continue until the water is completely frozen solid.

11. What is water?? Polar Molecule
NOT a Polar molecule
Hydrogen bond
Looks like
These have regions with a slightly positive and slightly negative charge so they attract, like a magnet
Molecule that shares the bonds more equally examples fats & oils.
The attraction between slightly positive Hydrogen atom and a slightly negative atom. One hydrogen bond is weak , but many hydrogen bonds are strong

12. Hydrogen bonding Demonstration
How many drops of water do you think will fit on a penny before the water breaks?
Write your guess into the space on your paper.

13. Water Properties High Specific Heat
Cohesion
Water sticks to each other- this creates surface tension.
Water resists temperature changes which helps regulate cell temperatures.
Properties of water
Adhesion
Solvent
Water is attracted to other substances-creates capillary action
Ex. transpiration-process when plants and trees remove water from the soil
Water is usually present in a greater amount and its polarity helps dissolve other substances.

14. Properties of water High Specific Heat & Solvent Return

15. Helps insects walk across water
Cohesion …
Return
Helps insects walk across water

16. Cohesion cont.
Cohesion allows some animals to do things that most thought were impossible:

17. Adhesion Causes Capillary Action
Which gives water the ability to “climb” structures

18. Adhesion Also Causes Water to …
Return
Adhesion Also Causes Water to …
Attach to a silken spider web
Form spheres & hold onto plant leaves

19. Cool Water Trick

20. Another cool water video

21. Properties of Water Exit Ticket
5 Questions Turn in before leaving class!!!!