BIOLOGY

Cooking Oil Activity

Lab Materials

Materials in your lab kit:

  • none

Additional materials you will need:

  • 1 clear glass
  • a measuring cup
  • a measuring tablespoon
  • cooking oil, any kind
  • liquid soap, any kind (e.g., dishwashing detergent, liquid laundry soap, liquid hand soap)

Activity

Fill a glass with one measured cup (8 oz.) of water. You will be adding some cooking oil to the water in the glass.

  • Before you add the oil, make a prediction as to whether the oil will mix with the water. Explain why you made this prediction.
  • Add approximately 2 tablespoons (the exact amount is not critical) of cooking oil to the water and mix thoroughly. Do not empty the glass. Record your observations.
  • What happened when you mixed the oil with the water?
  • Was your prediction correct? If not, can you now provide a reason to explain your results?
  • What property of water did this experiment show? Why? Provide an example, other than any discussed above, as to why this property of water that you observed in this experiment is beneficial to biological systems.
  • You will now be adding some liquid soap to the oil and water in the glass and mixing thoroughly.
  • Before you add the liquid soap, make a prediction as to whether the detergent with mix with the oil or mix with the water. Explain why you made this prediction.
  • Add approximately 1 tablespoon of liquid soap (the exact amount is not critical) to the oil and water in the glass and mix thoroughly. Record your observations.
  • What happened when you mixed the liquid soap with the oil and water?
  • Was your prediction correct? If not, can you now provide a reason to explain your results?
  • What property of water did this experiment show? Why? Provide an example, other than any discussed above, as to why this property of water that you observed in this experiment is beneficial to biological systems.

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Module 1: The Molecular and Cellular Bases of Life

Lab 2: Basic Chemistry

C. pH Testing

Lab Materials

Materials in your lab kit:

  • red litmus paper
  • blue litmus paper

Additional materials you will need:

  • vinegar
  • ammonia
  • water
  • urine

Activity

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Note: You should be careful with caustic substances such as ammonia and use only your own urine for this experiment. You should collect the urine in a disposable cup, and dispose of it in the toilet after testing it.

  • Cut each of your litmus papers in half so that you will have enough litmus paper for all of the tests.
  • Test each of the substances listed in the table below by dipping a piece of red litmus paper and a piece of blue litmus paper into each.
  • Observe the red litmus paper to see if it turns blue or stays red.
  • Observe the blue litmus paper to see if it turns red or stays blue.
  • Select four more household substances to test in the same manner.
  • Identify each substance an acid, base, or neutral solution.
  • Fill in the following chart:

 

Red Litmus Paper Color

Blue Litmus Paper Color

Is this substance an acid, base, or neutral?

Vinegar

Ammonia

Urine

Water

Additional Substance:

Additional Substance:

Additional Substance:

Additional Substance:

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