Name: ____________________ Partner: __________________ Date: ______
Osmosis Diffusion Mini Lab: Gummy Bears
Define:
DiffusionOsmosisSelectively permeablePassive TransportActive TransportHypotheses:
Name: ____________________ Partner: __________________ Date: ______
1.
2.
If the H2O concentration in salt water is (higher, lower) than the H20
concentration in a Gummy Bear, then Gummy Bears placed in salt water will
(increase, decrease, remain the same) size. Circle your answer.
3. What do you think will happen if you place a pre-soaked gummy bear (soaked in
plain water, or 0% salt) in a container of salt water? ______________________
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Procedure:
1. Obtain 3 small white cups, and label the following: 0%, 15%, 15% (PS)
Note: The “PS” references that the gummy bear has been “pre-soaked”
2. Obtain two dry gummy bears and take their measurements as follows:
Quantitative Data Day 1 
Gummy Bear 1
(Dry)
Gummy Bear 2
(Dry
Gummy Bear 3
(PS)
Height (mm):
Length (mm):
Width (mm):
Mass (g):
Qualitative observations of dry gummy bears (1 & 2):
Qualitative observations of pre-soaked gummy bear (3):
3. Obtain a third, pre-soaked gummy bear, and take its measurements above.
4. Measure out 30 mL of each liquid concentration (0, 15%, 15%) and place into
the corresponding cups.
5. Place one dry gummy bear in the 0% and 15% respectively. Then place the
pre-soaked gummy bear in the 15% PS solution.
6. Let sit overnight.
Name: ____________________ Partner: __________________ Date: ______
7. Calculate Volume and Density for each bear as follows…
Volume = length x width x height
Density = mass/ volume
Day 1 
Gummy Bear 1
(Dry)
Gummy Bear 2
(Dry
Gummy Bear 3
(PS)
Mass (g):
Volume (mm3):
Density (g/ mm3):
8. When you place a dry sponge on a puddle of water, it immediately mops up
the puddle. Using your knowledge of osmosis, explain why this is the case:
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9. Describe what happened during each of these events and why…
Name: ____________________ Partner: __________________ Date: ______
10. Day 2 Data Charts
Day 2 
Gummy Bear 1
(Dry)
Gummy Bear 2
(Dry
Gummy Bear 3
(PS)
Height (mm):
Length (mm):
Width (mm):
Mass (g):
11. Use the following calculations to complete the table below:
Volume = length x width x height
Density = mass/ volume
Day 2 
Gummy Bear 1
(Dry)
Gummy Bear 2
(Dry
Gummy Bear 3
(PS)
Gummy Bear 1
(Dry)
Gummy Bear 2
(Dry
Gummy Bear 3
(PS)
Mass (g):
Volume (mm3):
Density (g/ mm3):
Day 1 Volume
Day 2 Volume
Day 1 Density
Day 2 Density
12. Compare the volume and density from Day 1 and Day 2, and using your
knowledge of osmosis and diffusion, describe why the volume and density changed
as it did for each gummy bear (1, 2, and 3).  See next page 
Name: ____________________ Partner: __________________ Date: ______
Trend Analysis
Directions: Answer the questions below.
1.How did the initially dry gummy bear (#1) change after sitting in 0% salt solution?
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2. How did the initially dry gummy bear (32) change after sitting in 15% salt solution?
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3. How did the pre-soaked gummy bear (#3) change after sitting in the 15% salt solution?
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4. How does this experiment represent the relationship between osmosis and
hypo/hypertonic environments? Use data from your lab to support your answer.
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