Final answer:
During boiling, heat energy is absorbed by the substance to enable the phase change from liquid to vapor. This energy helps overcome intermolecular forces without raising the temperature. Thus, the correct answer is that the heat energy of the substance is absorbed during boiling.
Explanation:
Understanding Energy Changes During Boiling
Boiling is a physical process where a liquid turns into vapor upon heating. During this process, the substance undergoes significant energy changes, specifically concerning heat.
When a liquid boils, the heat energy provided to the substance is not lost. Instead, it is actually absorbed by the substance to overcome intermolecular forces, allowing the molecules to escape into the vapor phase. This energy is known as the heat of vaporization.
Key Points:
- The boiling point is the temperature at which a liquid's vapor pressure equals atmospheric pressure.
- Heat energy is crucial for the transition from liquid to vapor.
- During boiling, the temperature of the liquid remains constant until all of it has vaporized, as energy is used to transform the state rather than increase temperature.
In summary, the correct answer to the student's question is: Heat energy is absorbed by the substance.
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