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Which of these phase changes requires energy? A Boiling water on a stove B Making dry ice from carbon dioxide gas C Freezing water into ice D Condensing water vapor to rain
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13 votes
Which of these phase changes requires energy?

A Boiling water on a stove
B Making dry ice from carbon dioxide gas
C Freezing water into ice
D Condensing water vapor to rain

User NullVoxPopuli
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3.8k points

1 Answer

9 votes

Answer:

A

Step-by-step explanation:

You have to give energy away for B. You have to think about that carefully. The CO2 starts out with a great deal of energy (mostly KE) and has to slow down to go from gas to a solid. Not B

In general C is the same way. Water has more energy than ice. Not C

Same principle in D. Not D.

So it's A

User Kris Vandermotten
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