During a phase change, the temperature of a substance ____.

Question

BlackTom AI · Accepted Answer

First, let's restate the scenario to ensure clarity: during a phase change, the substance transitions from one phase to another (e.g., solid to liquid or liquid to gas) at a constant temperature.
Option 1: 'increases' — This is incorrect because the temperature does not rise while the substance is undergoing a phase change; energy is being used to break or form intermolecular bonds rather than to raise kinetic energy.
Option 2: 'decreases' — This is also incorrect for the same reason: there is no drop in temperature during the phase transition itself, since the added energy goes into changing the phase, not cooling the material.
Option 3: 'remains constant' — This is correct because the temperature stays fixed at the phase-change temperature while latent heat is absorbed or released to drive the phase transition.
Option 4: 'may increase or decrease' — This is incorrect because the defining feature of a phase change at a constant pressure is a plateau in the temperature-time (or energy-temperature) profile; temperature does not vary up or down during the phase change phase itself.
In summary, the key idea is that during a phase change, energy changes the state rather than the temperature, so the temperature remains constant at the characteristic phase-change temperature while latent heat is exchanged.

During a phase change, the temperature of a substance ____.

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