MADA RECIPES SUMMER 2013
Ice Cream in a Baggie
½ cup milk
½ teaspoon vanilla
1 tablespoon sugar
4-5 cups of ice
4 tablespoons of salt (1/4 cup)
2 quart size Ziploc bags
1 gallon size Ziploc bag
Mix the milk, vanilla, and sugar together in one of the quart size bags. Seal tightly (adults should check
the bags for young children), allowing as little air to remain in the bag as possible. Put the bag with the
mixture in it into a second quart sized bag. Also allow as little air in this bag as possible. Too much air left
inside may force the bag open during shaking.
Fill the gallon-sized Ziploc bag with ice and salt and put the smaller bag of milk mixture inside. Again, let
all the air escape and seal the bag.
Shake and massage the bag, allowing all the ice to surround the cream mixture. Five to eight minutes is
adequate time for the mixture to freeze into ice cream.
Want to extend this experiment?
*Explore the difference in using crushed or cubed ice
*Try using different amounts of ice and salt. Will more salt make it go faster or will it not make a
difference?
*Time how long it takes for the ice cream to freeze
What does the salt do?
Just like we use salt on icy roads in the winter, salt mixed with ice in this case also causes the ice to melt.
When salt comes into contact with ice, the freezing point of the ice is lowered. Water will normally freeze
at 32 degrees F. A 10% salt solution freezes at 20 degrees F and a 20% salt solution freezes at 2 degrees
F. By lowering the temperature at which ice is frozen, we are able to create an environment at which the
milk mixture can freeze at a temperature below 32 degrees F into ice cream.
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Gak
½ cup of glue
2-4 drops of food coloring
A few tablespoons of liquid starch (try Linit-Brand Liquid Starch)
Plastic cup
Spoon
Sandwich-sized Ziploc bag
Drop food coloring into your cup of glue. Mix it with a spoon until your glue is no longer white and it is the
color you would like it to be.
Add small spoonfuls of liquid starch. Stir after each spoonful is added.
When your mixture looks like you can touch it without your hand getting covered in glue, take it out of the
cup and play with it. If it feels a little sticky, add a drop of the liquid starch to your gak and mix it in with
your hands.
Enjoy!