What happens to the temperature of a substance during a phase change?A.It stays the same as energy is added.B.It increases rapidly as energy is added.C.It decreases as energy is added.D.It increases slowly as energy is added.
Question
What happens to the temperature of a substance during a phase change?A.It stays the same as energy is added.B.It increases rapidly as energy is added.C.It decreases as energy is added.D.It increases slowly as energy is added.
Solution
The correct answer is A. It stays the same as energy is added.
Here's why:
During a phase change, a substance is transitioning from one state of matter to another, such as from a solid to a liquid (melting), or from a liquid to a gas (boiling).
When energy is added to a substance to induce a phase change, that energy is used to break the bonds between the particles of the substance, rather than to increase the speed of the particles (which would raise the temperature).
So, during a phase change, the temperature of a substance remains constant until the phase change is complete. Only after the phase change is complete will additional energy raise the temperature of the substance.
Similar Questions
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