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Ice Cream Chemistry Lab
Purpose: How is it possible to create solid ice cream from a mixture of liquids and dry compounds?
Hypothesis:
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Materials:
1)
2)
3)
4)
5)
6)
7)
8)
Big Zippie Bag
Small Zippie Bag
2 Scoops Ice
1 scoop Rock Salt
¼ teaspoon vanilla
½ cup milk
¼ cup sugar
½ cup heavy whipping cream
Directions:
Collect materials at the stations. Fill big zippie halfway with ice and ½ cup of rock salt) Place small zippie with other
ingredients inside the big zippie with salt and ice. Shake for 20 minutes. Inspect and enjoy!
Analysis Questions:
Answer the following on your own paper:
1) What state of matter was the milk when you began?
2) What state of matter was the milk when you were done?
3) In order to change the phase of the milk, what had to be removed?
4) What happened to the heat energy that left the milk?
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5) Why was the salt added to the ice?
6) If you did not add sugar would the ice cream have frozen faster? Why?
7) Why did the outside of the bag get wet? (Assume that your bag did not spring a leak.)
8) How did your ice cream taste? What ingredients might you use to make your ice cream taste better?
9) Draw a picture of what happens to the water molecules throughout its phase changes during this lab.
liquid phase
solid phase
Conclusion: (Answer the purpose question. Did you hypothesis match your result? What is the chemistry/science
processes involved in making ice cream? Is this a physical or chemical change? How are phase changes and the concept
of freezing point important in this lab?)
Extension:
Why is salt spread on the roads before a winter storm?
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