During which process does the temperature of a substance remain constant (Changes of state and specific latent heat)

The correct answer is Melting a solid..

Evidence lens: Use the data, graph feature, practical observation, or particle behaviour that proves the answer. This question asks: During which process does the temperature of a substance remain constant (Changes of state and specific latent heat). The correct response is Melting a solid., because changes of state are explained by particle energy and arrangement. In Changes of state and specific latent heat, the marking point should connect directly to explain why temperature remains constant during a change of state even though energy is transferred. If the question includes values, the working must keep the appropriate unit and operation; if it is an explanation, it must name the relevant particle behaviour or energy change. This item belongs to Internal energy and energy transfers, so avoid answers that switch to a different quantity, confuse heat with temperature, or describe gas pressure without collisions when collisions are the reason. Checkpoint 417 is distinct because it uses this exact question context and the evidence lens rather than a generic particle-model sentence.