APFIVE Endothermic Reaction and Phase Change
A student observes frost forming on the outside of a test tube during a reaction. Which of the following best explains this observation?
A
The reaction produces water as a product that leaks through the tube
B
The reaction is exothermic, causing water vapor to condense
C
The reaction is endothermic, cooling below the dew point
D
The reaction creates a vacuum that pulls moisture from the air
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