Egg-Cellent Osmosis

Student Name ______Period ______

Part A: With your group, and suggestions from your teacher, create a procedure to answer this

Question: What are the effects of vinegar on egg shell hardness?

Prediction: I think that vinegar will ______.

I predict this because I already know that ______.

Materials Per group of 2 to 4 students:1 plastic or paper cup100 ml vinegar

1 hard-boiled eggpermanent marker

(Teacher will prepare control group)

Procedure: Our group will answer this question by…

Important considerations: How will your group identify your egg?

How long will you wait until the second observation?

What should the teacher’s control group be like?

Step 1

Step 2

Step 3

Step 4

Independent Variable (Difference between groups) ______

Dependent Variable (The outcome that we are measuring) ______

Observations:

Part B: With your group, and your egg from yesterday, create a procedure to answer this

Question:What solutions produce the most osmosis in a model “egg-cell.”

Prediction: I think that ______will cause the egg to ______.

I predict this because I already know that ______.

Materials Per group of 2 to 4 students:Shelled Egg (from yesterday)100 ml of solution # ______

tap water to rinseplastic or paper cup

permanent markertriple beam balance

cloth tape measurepaper towel

Procedure Our group will answer this question by …

Important considerations:How will your group identify your egg?

Do you know what is in your solution?

How long will you wait until your next observation?

What measurements will you compare? (remember bubble gum test)

What should the control group be like?

Step 1

Step 2

Step 3

Step 4

Step 5

Step 6

Independent Variable (difference between groups) ______

Dependent Variable (the thing we are measuring) ______

Constants (things that are the same for all groups) ______

Control Group (what will you compare to) ______

Part C Data, observations, and conclusion

EGG BEFORE / EGG AFTER / EGG CHANGE
Control (water)

Analysis and Conclusion.

1-Why did you soak the egg in vinegar on the first day?

2- Did your solution contain more water than your egg or less water than your egg? ______How do

you know?

3- What would you do different if you did this experiment again?