1. Water…

2. What are the Properties of Water?1

3. How do bugs walk on water?

4. What is happening?
How does a paper towel “slurp up” liquid?

5. Why the curve?

6. What is weird about water?
Do you know how magnets work?
Opposite magnets attract each
Water acts like a magnet…
Water has opposite charges at opposite ends
This is called Polarity

7. Water molecules act like magnets Polarity causes: Cohesion &
Adhesion &
Surface Tension

8. Cohesion
Attraction between particles of the same substance (why water is attracted to itself)
Think “co-operate” (work together)
Results in Surface tension
Produces a surface “film” on water that allows insects to walk on the surface of water 1

9. Interaction Between Water Molecules
Negative Oxygen end of one water molecule is attracted to the Positive Hydrogen end of another water molecule to form a HYDROGEN BOND

10. Surface Tension
The “membrane” at the surface of the water is called “Surface Tension”

11. Bugs and more! - Cohesion
Jesus Christ Lizard
and this too!

12. Water acts like a magnet
Water molecules have a positively charged side and a negatively charged side
When molecules come together, they stick like metal to a magnet

13. Adhesion Attraction between particles of water and other substances
Think “adhesive tape” (sticks to other stuff)
Results in water droplets sticking to things despite gravity
Results in Capillary Action
Water “climbing” against gravity
Produces a curved surface called a Meniscus
Water molecules are attracted to the molecules in a graduated cylinder 1

14. Adhesion Causes Capillary Action
Adhesion gives water the ability to “climb” structures...
That's how the paper towel seems to “slurp-up” liquids!

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

16. High Specific Heat
Water is able to absorb a lot of heat before it gets hot enough to boil 1

17. High Heat of Vaporization
What is vaporization?
Water requires a lot of energy to change a molecule of liquid water into a molecule of water vapor (gas) 1

18. Less Dense as a Solid Why do ice cubes float on water?
In liquids and gases, the molecules are moving...
When frozen, water molecules are “locked” in place... and the polarity causes water to attract and repel at the same time! 1

19. When water freezes...
Ice actually has a very different structure than liquid water
The molecules align themselves in a regular lattice pattern with “air pockets” between the molecules
So, liquid water is more dense than frozen!
Which is why ice floats on water!