Question detail

What happens to the temperature of a substance during a change of state (Internal energy)

Try the question, check the answer, then read the explanation to understand the curriculum point.

Show answer Topic hub Objective page

At a glance

MCQ

Type

practice

Style

Topic

Internal energy and energy transfers

Question

A. It increases continuously.
B. It decreases continuously.
C. It remains constant.
D. It fluctuates randomly.

Answer

The correct answer is It remains constant..

Explanation

Practical lens: Link apparatus, readings, and uncertainty to the exact measurement named in the objective. This question asks: What happens to the temperature of a substance during a change of state (Internal energy). The correct response is It remains constant., because changes of state are explained by particle energy and arrangement. In Internal energy, the marking point should connect directly to explain why energy transfer can change state without changing temperature. 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 254 is distinct because it uses this exact question context and the practical lens rather than a generic particle-model sentence.

Common mistake

Confusing Temperature and Internal Energy

Students often confuse temperature with internal energy, thinking that an increase in temperature always means an increase in internal energy.

Remember that temperature is a measure of the average kinetic energy of particles, while internal energy includes both kinetic and potential energy. Energy transfer can change the state of a substance without changing its temperature.

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