Ice cream lab

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Ice cream lab

• Changes in state,
• Energy transfer

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Hand crank ice cream maker
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Big question

• How does the change in energy within an object
  affect its state of matter?

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Need 4-5 volunteers
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Set-up for Ice Cream

• Location of supplies
• Volunteers to run stations
• Clean-up and throwing away of trash
• In case of Spills
• If you do not like or can not eat ice cream

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Equipments and ingredients

• 2 tablespoons of sugar
• 1/2 cup of milk
• a few drops of vanilla or other extract for
  flavor. 
• zip-lock sandwich bag
• 1 gallon zip-lock freezer bag
• Lots of ice cubes,
• 2 tablespoons of rock(kosher) salt. 
• Towels!
• Gloves!

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Steps for making Ice Cream

• In a small plastic bag, pour ½ cup of milk, 2
  tablespoons of sugar, and 3-4 drops of vanilla
• DO NOT BE GREEDY
• Seal Bag without air. Place in second bag.
  Seal and tape outer bag without air.
• Place ice (2-3 large cups) into gallon bag .
  Add 2 tablespoons of Kosher or rock salt. Seal
  up gallon bag. Enclose in 2nd gallon bag.

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Making Ice Cream

• Gently massage the components together for 5-10
  minutes.
• The bag will get VERY COLD. Use a towel , or
  insulated gloves
• Ice cream is ready when mixture feels like clay,
  with grit

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Eating the Ice Cream

• Open outer bag carefully , try to save bag.
• Dump ice-salt water mix into indicated trash can
• Open inner bags with scissors or by hand. Try
  not to let salt-water mix get to ice cream
• With spoon ,transfer ice cream to cup
• Remember administrators and teachers like ice
  cream too!

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After making and eating the ice-cream

• Answer Questions based on Ice Cream Lab

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Ice Cream lab questions

1. If ice cubes are put into a drink, how come the
   drink does not freeze?
2. Name 3 specific endothermic changes that occurred
   during the lab
3. Name 3 specific exothermic changes that occurred
   in the lab

• 4. Explain in terms of energy, why the milk
  mixture turned into ice cream.
• 5. If you repeated the lab set-up, but left the
  bags but did not spend time massaging the bags,
  what result would you expect. Explain why, in
  terms of energy
• 6. What was the purpose of the salt? Explain
  your answer in terms of energy

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CLEAN UP AFTER YOURSELF

• I AM NOT YOUR
• PARENT or Guardian!!