Ice cream lab. Changes in state, Energy transfer. Hand crank ice cream maker. Big question. How does the change in energy within an object affect its state of matter?. Need 4-5 volunteers. Set-up for Ice Cream. Location of supplies Volunteers to run stations
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Changes in state,
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.
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.
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
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!
Answer Questions based on Ice Cream 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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