Question detail
Which of the following statements is true regarding changes of state?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Changes of state and the particle model
Question
- A. Mass is lost when a solid melts
- B. Mass is conserved during boiling
- C. Mass increases when a gas condenses
- D. Mass is gained during evaporation
Answer
The correct answer is Mass is conserved during boiling.
Explanation
Evidence lens: Use the data, graph feature, practical observation, or particle behaviour that proves the answer. This question asks: Which of the following statements is true regarding changes of state. The correct response is Mass is conserved during boiling, because density links mass and volume, so the answer must preserve which quantity is being calculated. In Changes of state, the marking point should connect directly to explain that mass is conserved when a substance changes 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 Changes of state and the particle model, 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 177 is distinct because it uses this exact question context and the evidence lens rather than a generic particle-model sentence.
Common mistake
Mass Conservation Misunderstanding
Students often think that mass can change when a substance changes state, such as when ice melts into water.
Emphasize that mass is conserved during changes of state, meaning the total mass before and after the change remains the same.
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