Is energy added, or is it released, when boiling water is changed to steam?
Whether the energy is added or released, when boiling water is changed to steam.
Answer to Problem 20RQ
The energy is added when the boiling water is changed to steam.
Explanation of Solution
A transfer of heat energy occurs when the phase of the object or substance changes. This is because energy is needed to split the bonds of the phase so that it gets converted into another phase. For example, energy is added to solids in order to change it into the liquid phase.
On the other hand, energy is taken away when phase change is in the opposite direction. The temperature of the substance does not change during the phase change process. In case of phase change from boiling water to steam, a certain amount of heat energy is added to the boiling water so that bonds between the molecules break and the boiling water gets converted into steam.
Conclusion:
Therefore, the energy is added when the boiling water is changed to steam.
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