<p>Water Lab Olympics! Name: ______</p><p>Draw a Water molecule: (copy the one on the board)</p><p>Fill in the blanks:</p><p>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. </p><p>Define:</p><p>Cohesion- </p><p>Surface Tension-</p><p>Adhesion-</p><p>Hydrophilic-</p><p>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):</p><p> c. Why do you think the needle need to be dry and clean?</p><p> d. Which part of this activity demonstrates cohesion?</p><p>2. Dry penny activity a. Number of drops you added: ______</p><p> b. What did the water look like on the penny before it spilled over?</p><p> c. Why did the water eventually spill over?</p><p>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.</p><p>2. Slide w/ cooking oil: a. Record your observations.</p><p> b. Is cooking oil hydrophilic or hydrophobic? How do you know?</p><p>Event #3: Demonstrate the hydrophilic properties of detergent. 1. Slide with detergent. a. Record your observations.</p><p> b. Is detergent hydrophilic or hydrophobic? How do you know?</p>