Diffusion and Semi-Permeable Membranes

Procedure:

Day 1: Weigh a raw egg and place in 200ml of vinegar. Cover and leaveover night. (The shell will disintegrate leaving the membrane visible).

Day 2: Measure the amount of vinegar and weigh the egg. Write answersin data chart. Place the egg in 200ml of light corn syrup, cover and leaveover night.

Day 3: Weigh the egg and the amount of liquid in the beaker. The eggwill be shriveled up and there will be an increase in the ml present in beaker.Place the egg in 200ml of water, cover and leave over night. Day 4: Weighthe egg and measure the amount of fluid left in the beaker. Have one of yourstudents smash the egg in a bucket (They love it!)

Questions:

  1. What process was demonstrated by the demo? Explain your answer?
  2. Describe the characteristics of the membrane and how the demo demonstrated the function of the membrane.
  3. How does this demonstration explain what happens in your cells?

Data
Day

Weight of
egg before

Weight of
egg after

mL of liquid
before

mL of liquid
after

Observations

1
2
3
4


Questions? Comments?
Shannon