Ice Cream Activity

Ice Cream Activity

2nd Grade PSI Science

Teacher’s Notes

· The bags get very cold. Wrap the bags in newspaper or hand towels to minimize “finger-freeze.” Double bagging the ice-cream liquid reduces the risk of salt and water leaking into the ice cream.

· Background Information: Salt lowers the temperature at which ice is frozen. This allows the milk mixture to freeze at a temperature below 32 degrees and become ice cream.

· Follow-up Discussion Questions:

1. How did the liquid become a solid?

2. How does the solid become a liquid?

3. How can you improve the recipe?

· Recommended books about ice cream:

· Ice Cream: The Full Scoop by Gail Gibbons

· From Cow to Ice Cream by Bertram T. Knight

Ice Cream Activity Name: ______

2nd Grade PSI Science

Introduction

Matter can change from one state to another by heating or cooling. Heating a solid causes it to turn into a liquid. Cooling a liquid causes it to turn into a solid. In this activity, you will investigate changing states of matter in response to temperature change.

Materials:

· ½ cup cream

· 1 tablespoon sugar

· 1 teaspoon vanilla extract

· 1 quart Ziploc bag

· 1 gallon Ziploc bag

· 4 cups ice

· 4 tablespoon salt

Procedure:

1. Mix the cream, vanilla, and sugar together in the quart-size bag.

2. Remove as much air as possible to avoid leakage. Seal tightly.

3. Fill out the “Before” box on your worksheet.

4. Put the quart bag inside the gallon bag and fill with ice. Sprinkle salt on top.

5. Remove as much air as possible and seal tightly.

6. Shake the bag vigorously for 8-10 minutes. Fill out the “During” box on your worksheet.

7. After 8-10 minutes, observe your bag. Fill out the “After” box on your worksheet.

8. Open the small bag and enjoy the ice cream!

9. Complete the final question on your worksheet.