Essential Chemistry for IGCSE - Particles And Purification (Section 5 - No. 41)
What happens to the temperature of a substance during a phase change (e.g., melting or boiling)?
The temperature increases steadily.
The temperature decreases steadily.
The temperature remains constant.
The temperature fluctuates randomly.
Explanation
During a phase change, the energy is used to overcome the forces between the particles, not to increase kinetic energy, so the temperature remains constant.
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