Question detail

Why does energy transfer during a change of state affect potential energy rather than average kinetic energy (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

  1. A. Because temperature is constant during the change.
  2. B. Because potential energy is always higher than kinetic energy.
  3. C. Because kinetic energy is not involved in state changes.
  4. D. Because energy is only absorbed, not released.

Answer

The correct answer is Because temperature is constant during the change..

Explanation

Evidence lens: Use the data, graph feature, practical observation, or particle behaviour that proves the answer. This question asks: Why does energy transfer during a change of state affect potential energy rather than average kinetic energy (Changes of state and specific latent heat). The correct response is Because temperature is constant during the change., because specific latent heat concerns energy transferred during a state change with no temperature rise. In Changes of state and specific latent heat, the marking point should connect directly to define specific latent heat as the energy needed to change the state of one kilogram of a substance with no change in 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 369 is distinct because it uses this exact question context and the evidence lens rather than a generic particle-model sentence.

Common mistake

Confusing Latent Heat with Temperature Change

Students often confuse specific latent heat with the energy required to change temperature, not realizing that latent heat refers to energy needed for a state change without temperature change.

Emphasize that specific latent heat is the energy needed to change the state of a substance (like melting or boiling) while the temperature remains constant.

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