Name: ______Date: ______

Partners: ______Period: ______

Design your Iodine Experiment

Problem: How do different items keep an iodine solution separate from a starch solution?

Materials: Iodine, Water, Large Beakers, Corn Starch, Freezer bags, Sandwich bags, Small glass bottles, Glass test tubes, Plastic tubes, Wax paper, Aluminum foil, Twist ties, Your ideas

Procedure:

1. Fill the beaker about400 mls of the way up with water. Put about 30

drops of iodine in water and mix. (If you would like to use something

otherthan a beaker, let your teacher know!)

2. In a plastic cup, mix about 3 or 4 spoonfuls of cornstarch and half full of water to make the corn starch solution.

3. Choose 3 different materials that you would like to test for keeping a cornstarch solution separate from the iodine solution.

4. Place some of the cornstarch solution into one of your testing material and then submerge in the beaker with the iodine solution. Put it aside to examine later.

(If you have any other ideas of materials to test or a different way to do it, run it by your teacher and let’s try it!)

5. Repeat the same procedure in step 4 with your other two testing materials.

6. Fill in the hypotheses for all 3 of your materials.

7. Draw a diagram of your 3 tests.

8. Near the end of class we will check our results and complete the data table.

9. Write a conclusion paragraph about what you found in the tests.

Hypotheses:

What do you think will happen in your test? Will the solutions stay separate? Will they mix? Why do you think that? (Use your prior knowledge!)

Example hypothesis: If I put a corn starch solution in a steel box and submerge it in an iodine solution, then the solutions will stay separate because steel is solid and can’t be penetrated by anything.

Hypothesis for Material 1:

Material used: ______

If I ______

Then ______

Because ______

Hypothesis for Material 2:

Material used: ______

If I ______

Then ______

Because ______

Hypothesis for Material 3:

Material used: ______

If I ______

Then ______

Because ______

Drawings:

Material Used: / Picture of Experiment Set-up
1.
2.
3.

Data Table:

Material Used: / What Happened? Make at least 3 observations.
1.
2.
3.

Conclusion:

(Below, write what happened overall to each of your materials. Were all your hypotheses right? Were there any surprises? What future experiments would this lead you to want to try? Explain your findings!)