HYPOTHESIS

Surface tension helps objects to float in water. Will the surface tension of water be affected if oil or soap are added to the water?

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MATERIALS & EQUIPMENT

• 1 Petri dish or bowl
• pepper
• water
• oil
• liquid soap

LAB SAFETY AND PROTOCOL

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PROCEDURE

1. Fill the Petri dish half way with water.
2. Sprinkle pepper evenly over the top. Describe the behavior of the pepper. Does it sink or float? Does it spread out or clump together?

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3. Let one drop of oil fall in the middle of the Petri dish. What happens?

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4. Let one drop of soap fall in the middle of the Petri dish. What happens?

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5. If you sprinkle some more pepper on the liquid, what do you think will happen to it?

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6. Try it. What does happen?

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CONCLUSION

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Copyright 1996, D.M.Candelora. All rights reserved. Reproduction for educational use is encouraged.