I CE C REAM L AB The Chemistry of Ice Cream

W ARNINGS This activity is meant to be enjoyed; however, we need to respect our classmates and classroom, so there are a few rules: Follow instructions carefully! If you mess up, you DO NOT GET TO START OVER!! If you are wasting materials or playing around, you will not be able to participate anymore. Clean up your mess when you are done, or food/candy will not be given in class anymore.

M ATERIALS /I NGREDIENTS 1 large ziploc bag 1 small ziploc bag ¼ cup sugar ½ cup whole milk ½ cup cream ¼ teaspoon vanilla 2 cups ice ½ cup salt

PURPOSE The purpose of making ice cream in Chemistry class is to see the phase change from liquid to solid as well as if the experiment is an endothermic or an exothermic reaction.

HYPOTHESIS Making ice cream is an example of ___________, a phase change. Melting, Freezing, Sublimation, Condensation, Deposition, Boiling Making ice cream is an example of an ________ reaction. Endothermic, exothermic

D ATA TABLE Describe what happens as you shake the ingredients:

I NSTRUCTIONS Step 1: Get 1 LARGE Ziploc Bag and 1 SMALL Ziploc bag from Mrs. Schabilion and go to stations. Step 2: In the SMALL bag, add ¼ cup of sugar Step 3: In the SMALL bag, add ½ cup of whole milk

Step 4: In the SMALL bag, add ½ cup of cream Step 5: In the SMALL bag, add ¼ teaspoon of vanilla. SEAL THE BAG TIGHTLY!! (Get all air out) Step 6: In the LARGE bag, add 2 cups of ice and ½ cup of salt.

N EXT S TEPS 7. Place the SMALL bag INTO the LARGE bag and seal the large bag tightly (make sure there is as little air in the bag as possible. 8. Holding the large bag by the top seal, gently rock the bag from side to side. Do not hold the bag in your hands—it will be cold enough to cause tissue damage to your hands (use a towel if necessary)

9. Continue rocking the bag until the contents of the quart bag have solidified (10-15 minutes) 10. When done, empty ice in bucket, return large bag to Mrs. Schabilion 11. Cut small bag on corner, divide for partners!!

CONCLUSION 1.) Was your hypothesis correct? 2.) What happened to the sugar? What caused the liquid (milk) to change to a solid (ice cream)? 3.) Although it physically looks different, is your ice cream still just milk, vanilla, and sugar mixed together and frozen?

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