Diffusion Lab
Materials: old, stale, gummy bear, water container, ruler, and balance.

Copy the data table on one page in your science notebook. On a second page write your hypothesis, analysis, and conclusion.

Day 1
Day 2
Difference

Procedure:
Bear Color




1. In pencil, write your bear’s name on a paper scrap and put it in the jar.
Length




2. Read the question and write a hypothesis.
Width




3. Measure the length, width, height, and mass of your bear. Put it in water.
Height




4. Calculate your bear’s volume. Length x width x height = volume
Mass




5. Calculate your bear’s density. Mass ÷volume = density
Volume




6. The next day, repeat steps 3, 4, & 5.
Density




7. Answer the analysis questions.
8. Write a conclusion.
Question: What do you think will happen to a stale bear when you put it in water over night?

Hypothesis: (Predict what you think will happen to the length, width, height and mass of the bear after soaking.)

Analysis:
1. Was your hypothesis correct? Why or why not?
2. Which change is greater – volume or mass? Explain.
3. Was there a change in density? Why?
4. How was diffusion involved in your gummy bear’s change?
5. If your bear were surrounded by a cell membrane, what process would have occurred?

Conclusion:
Five sentence paragraph: Answer the question; include data; was your hypothesis supported or not?