Water Lab Olympics! Name: ______

Draw a Water molecule: (copy the one on the board)

Fill in the blanks:

1. Today, ______of the Earth’s surface is covered by water. 2. About ______% of your body’s mass is water. 3. Water ______more slowly than most other substances. 4. Many organisms dispose of excess heat through ______. For example, humans cool down by ______. 5. Water molecules readily form special bonds, called ______with one another. 6. These bonds form between more ______charged ______atoms and the more ______charged ______atoms. 7. ______and ______are responsible for the upward movement of water.

Define:

Cohesion-

Surface Tension-

Adhesion-

Hydrophilic-

Hydrophobic- Event #1: Demonstrate adhesion, cohesion, & surface tension properties of water 1. Floating a dry needle on the surface of water: a. Time it took YOU to accomplish task:______b. 3 observations about the needle (use magnifying glass):

c. Why do you think the needle need to be dry and clean?

d. Which part of this activity demonstrates cohesion?

2. Dry penny activity a. Number of drops you added: ______

b. What did the water look like on the penny before it spilled over?

c. Why did the water eventually spill over?

Event #2: Slip-n-slide: Demonstrate the hydrophobic properties of oil. 1. Glass slide w/ water: Describe what happened to the water when it was placed on the slide.

2. Slide w/ cooking oil: a. Record your observations.

b. Is cooking oil hydrophilic or hydrophobic? How do you know?

Event #3: Demonstrate the hydrophilic properties of detergent. 1. Slide with detergent. a. Record your observations.

b. Is detergent hydrophilic or hydrophobic? How do you know?