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Making ice cream and then letting some of it melt are two examples of phase changes.
The extreme cold of the ice cream maker causes the liquid cream to give up its heat and turn solid. This freezing phase change is exothermic because energy (heat) comes out of the cream.
If you leave a bowl of ice cream on the table in a warm room, the heat energy of the air will enter into the ice cream and it will become liquid. This melting phase change isendothermic.
Memory tip:
exo - the heat energy exits the cream, which gets colder.
endo - the heat energy goes into the ice cream, which gets warmer.
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Making ice cream and then letting some of it melt are two examples of phase change.The freezing cold of the ice cream maker causes the liquid cream to give up its heat and turn solid. This freezing phase change is exothermic because energy (heat) comes out of the cream.If you leave a bowl of ice cream on the table in a warm room, the heat energy of the air will enter into the ice cream and it will become liquid. This melting phase change isendothermic.Memory tip:exo - the heat energy exits the cream, which gets colder.endo - the heat energy goes into the ice cream, which gets warmer.
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