Sticky Water Activity - Penny.doc - STICKY WATER ACTIVITY Purpose Students while working on their own will investigate the properties of water and

# Sticky Water Activity - Penny.doc - STICKY WATER ACTIVITY...

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STICKY WATER ACTIVITY Purpose: Students while working on their own will investigate the properties of water and compare the clinging ability of polar molecules versus that of non-polar molecules. Procedure: 1. Each student should review their notes on the structure and properties of water and biomolecules 2. Based on what you now knows about polar substances make a prediction as to how many drops of water can be put on a penny before spilling off the edge. Also make a prediction on how many drops of alcohol can be placed on a penny before spilling off. 3. Clean the faces of 2 pennies with a paper towel. 4. Lay the 2 clean pennies side by side (about 6 inches apart) and heads up on a paper towel. 5. Slowly place drops of water from a pipette (medicine dropper) onto the head of one penny. Count each drop and continue until the accumulated water spills off the edge of the penny. Write your number down the number of drops. 6. Repeat step 5 using rubbing alcohol and the other penny. Write your number down.

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Unformatted text preview: 7. Clean off and dry both pennies and start over again. Repeat 2 more times (3 times total) 8. When finished, clean and dry the pennies and your table and throw the used paper towels away. The table should be as clean and organized as when you started. ＊ Hold the tip of the pipette close to, but not touching, the penny or the surface of the liquid on the penny. ＊ The distance from pipette to penny surface used with water should be the same as that used with the alcohol. Analysis: 1. Explain why your results were or were not close to your prediction. 2. Why were you asked to repeat the experiment 3 times, explain? 3. Why do you think the two liquids (water vs. alcohol) had different results, explain your answer? 4. Explain how do the results of the experiment support the concept of polarity and molecules sticking to each other? (Use vocabulary from your knowledge of water and biomolecules in your explanation) STICKY WATER ACTIVITY...
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