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Delicious Ice Cream: A Fun Experiment to Understand Phase Changes

Learn how to make homemade ice cream while exploring the science of phase changes! This hands-on activity involves mixing milk, vanilla, and sugar before encasing it in layers of bags filled with ice and salt. As you shake the mixture, observe how the heat energy is removed from the milk, leading to its transformation from liquid to solid. Ideal for kids and families, this experiment not only results in a tasty treat but also answers fascinating questions about matter and energy. Safety first: follow all instructions carefully!

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Delicious Ice Cream: A Fun Experiment to Understand Phase Changes

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  1. ICE CREAM MATTERS A TASTY PHASE CHANGE

  2. Safety First!!!! • Follow all instructions • Report all accidents

  3. Materials: • 1/2 cup milk
1/2 teaspoon vanilla
1 tablespoon sugar
4 cups ice
4 tablespoons salt 1 sandwich size bag 1 quart size Zip-loc bag (double to prevent spill) 1 gallon size Zip-loc freezer bag
A hand towel or gloves to keep fingers from freezing as well!

  4. Step 1: Mix the milk, vanilla, and sugar together in the sandwich size bag BE CAREFUL:Seal tightly, allowing as little air to remain in the bag as possible!!!!

  5. Step 2: Put the (sealed!) milk mixture bag into the quart size Zip-loc bag to prevent leaks and seal

  6. Step 2: Put the bags inside the gallon size bag and fill the bag with ice, then sprinkle salt on top ****Sealed release air!!!!

  7. Step 3:Wrap the bag in the towel, and shake the bag, making sure the ice surrounds the cream mixture.

  8. Step 4: Five to eight minutes is adequate time for the mixture to freeze into ice cream.

  9. Consider the following: • What state of matter was the milk when you began? • What state of matter was the milk when you were done? • In order to change the phase of the milk, what had to be removed? • What happened to the heat energy that left the milk? • Why was the salt added to the ice? • If you did not add sugar would the ice cream have frozen faster? Why? • Why did the outside of the bag get wet? (Assume that your bag did not spring a leak.) • Extension: Why is salt spread on the roads before a winter storm?

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