Question detail
What happens to the temperature of a substance during a change of state (Changes of state and specific latent heat)
Try the question, check the answer, then read the explanation to understand the curriculum point.
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
Exam lens: Write the relationship, substitute values only when needed, and finish by interpreting the result. This question asks: What happens to the temperature of a substance during a change of state (Changes of state and specific latent heat). The correct response is It remains constant., 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 419 is distinct because it uses this exact question context and the exam lens rather than a generic particle-model sentence.
Common mistake
Confusing Temperature with Internal Energy
Students often think that temperature and internal energy are the same, leading to incorrect explanations about energy transfer during state changes.
Emphasize that temperature measures the average kinetic energy of particles, while internal energy includes both kinetic and potential energy. Clarify that energy transfer can occur without a change in temperature during state changes.
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