# 4 make a hypothesis about what will happen when you

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4. Make a hypothesis about what will happen when you touch a plain toothpick gently to the center of the milk. Be sure to use an “if-then” statement. 5. Touch milk with the tip of a plain toothpick. Make observations for at least 30 seconds. Record them in the space below. After I put the clean toothpick in the milk… 6. What would happen if a toothpick covered with detergent/soap is dipped into the milk? Make a hypothesis about what will happen. Again, use an “if-then” statement. 7. Dip the toothpick into the detergent and touch the surface of the milk with the toothpick. DO NOT stir the milk. 8. Make observations for at least 60 seconds. Record them in the space below. 9. Touch the milk again with the detergent dipped toothpick. Observe for at least 60 seconds. 10. Repeat procedures 3-9 for 1% milk. Adapted by K. Rushton from “Magic Milk Lab,” by Matthew Vanderbeck, 2011, Clear Creek ISD. The difference is the quantity of sugar. Where cream and milk droplets are not separated. Hypothesis: The milk will not be disrupted. Observations: Nothing happened. Hypothesis: The coloring separates and thins out. Observations: The colors are resisting each other and spreading towards the boundaries.
Group Names: Teacher: Date & Period: Analysis & Conclusion: 1. Why do you think you tested a clean toothpick before using a toothpick with soap? 2. What was the independent variable in this experiment? What is the independent variable in this experiment? Which variables are constants?

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• Fall '19
• Agar plate, Petri dish, Julius Richard Petri

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