1. Water’s Unique Property Lab

2. Experiment #1: What is cohesion? -waters attraction to other water molecules

3. Cohesion: the attraction between like molecules. (one water molecule to another water molecule. - Due to the fact that water is a polar molecule and opposites attract.

4. Experiment #5: What is surface tension? A property of liquid surfaces that causes the surface layer to behave like a thin elastic 'skin'. Molecules in a liquid have attractive forces that hold them together. Molecules on the surface are attracted to molecules from all sides and below, but not from above....

5. Experiment #3: Water Alcohol

6. Density: Mass/Volume Water in it’s solid form is less dense than its liquid form. But why?

7. Again, WHY ? When frozen, the water molecules slow down and due to their polarity they will line themselves up + to – end thus taking up more volume and lowering it’s density.

8. O H - +.. O - HH + H H H H O O Solid Liquid

9. Likes dissolve likes Water is polar so it will dissolve any other substance that is polar A polar molecule has one + and one – end

10. Did salt dissolve in water? Yes it did Why? Salt is NaCl Na+1 Cl-1 Since salt has a + and – end it is polar

11. Did sugar dissolve in water? Yes it did Why? Sugar is a polar molecule

12. Did oil dissolve in water? NO Why? water is polar oil is not polar, it is nonpolar

13. Did powder soap dissolve in water? NO Why? water is polar soap is not polar, it is nonpolar

14. Why? Grease/oil is nonpolar and soap is nonpolar

15. What occurred? Why did this occur?

16. Due to cohesion and adhesion Adhesion: Waters attraction to other substances Water attracted to the string Cohesion: Water attracted to other water molecules