This lesson is a delicious way to teach students about one type of physical change that matter can under go – liquids transforming into a solid.
Divide the class into groups and provide each with ingredients (makes about 3 cups ice cream).
Have students measure the first four ingredients and place them in a quart-size plastic bag.
Seal the bag and tape over the opening (duct tape works well).
Taping shut the quart bag keeps the rock salt from getting into the ice cream.
Place the quart bag inside a gallon bag then pack crushed ice around it.
Pour at least ¾ cup of rock salt evenly over the ice.
Close the gallon bag, removing as much air as possible.
Have students hypothesize about what will happen to the liquid mixture once they start shaking it.
Wrap a towel around the bag. Have the students take turns shaking the ingredients for 5-10 minutes.
Open the outer bag.
Remove the inner bag containing the ingredients.
For full instructions, please download our PDF
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