Ice-Cream Lab

Making Ice Cream

Materials

½ Cup Milk

6 teaspoons of sugar

1 teaspoon of vanilla

1 quart sized Ziploc bag

1 gallon sized Ziploc bag

Crushed ice

8 tablespoons of Kosher Salt in gallon bag

1 spoon

Procedure

  1. Pour ½ cup milk into a plastic cup.

  1. Add 6 teaspoons of sugar into your cup. Stir to dissolve the sugar.

  1. Add 1 teaspoon of vanilla to your cup. Stir.

  1. Pour your milk mixture into a quart sized Ziploc bag.

  1. Close the bag securely (if you do not close your bag well, your ice cream will taste SALTY)

  1. Half fill a 1 gallon Ziploc bag with crushed ice.

  1. Add 8 tablespoons of salt to big freezer bag and ice.

  1. Place the milk containing ziplock baggie inside the large ziplock bag with ice and salt.

  1. Close the larger bag and gently shake the bag.

  1. Gently keep the inner bag mixing (you do NOT want the inner bag to open).

  1. After 25 minutes or so, the ice cream should be ready to scoop and eat.

Observations:

Record your observations here. What did you observe during the experiment? How soon did the milk mixture begin to change phases? How fast did you shake the bag? What did the bag feel like? What did the milk mixture feel like at first? After 10 minutes? At the end?

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Application Questions.

  1. Which of the following phase changes occurred?
  2. Solid → Liquid
  3. Liquid → Solid
  4. Gas → Solid
  5. Gas → Liquid
  1. What happened to make the phase change occur?
  2. The motion of atoms was increased
  3. The space between atoms was increased
  4. Heat was added to the milk mixture
  5. Heat was removed from the milk mixture
  1. How was the speed of atoms affected during the phase change?
  2. The speed was not affected, stayed the same
  3. The speed increased
  4. The speed decreased
  5. Atoms do not move
  1. Draw a diagram of the atoms in the milk mixture vs the atoms in the ice cream.

Milk Mixture Ice-cream

  1. How could you return the ice cream back to a liquid state?
  1. How could you turn the milk mixture into a gaseous state?
  1. What would you change or do differently if you were to repeat this activity?
  1. Design a machine to make ice-cream. Draw a diagram and explain how it would work.