Question detail
What is the specific latent heat of a substance ? P43-062 Changes of state and specific latent heat checkpoint
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. Energy needed to change state without temperature change ? P43-062 specific heat capacity reasoning
- B. P43-062 trap: this swaps specific heat capacity reasoning for a neighbouring particle-model idea.
- C. P43-062 trap: this omits interpret, heating, cooling from the explanation.
- D. P43-062 trap: this answer belongs outside Changes of state and specific latent heat.
Answer
The correct answer is Energy needed to change state without temperature change ? P43-062 specific heat capacity reasoning.
Explanation
Particle lens: Describe arrangement, motion, spacing, collisions, or energy changes only when they are relevant here. This question asks: What is the specific latent heat of a substance ?. The correct response is Energy needed to change state without temperature change ? P43-062 specific heat capacity reasoning, 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 interpret heating and cooling graphs that show temperature changes and flat sections during changes of state. 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 432 is distinct because it uses this exact question context and the particle lens rather than a generic particle-model sentence.
Common mistake
Misunderstanding Flat Sections
Students often misinterpret the flat sections of heating and cooling graphs as periods of no energy transfer.
Explain that during these flat sections, energy is being transferred to change the state of the substance, even though the temperature remains constant.
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