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. They are chemical changes.
- B. Mass is not conserved during the change.
- C. They are physical changes.
- D. They always involve temperature increase.
Answer
The correct answer is They are physical changes..
Explanation
Boundary lens: Keep this separate from nearby specification points that use similar words but test a different idea. This question asks: Which of the following statements is true regarding changes of state. The correct response is They are physical changes., because density links mass and volume, so the answer must preserve which quantity is being calculated. In Density of materials, the marking point should connect directly to describe how to determine the volume of an irregular solid using displacement of water. 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 82 is distinct because it uses this exact question context and the boundary lens rather than a generic particle-model sentence.
Common mistake
Common Mistake in Volume Calculation
Students often forget to account for the initial water level when measuring the volume of an irregular solid using water displacement.
Always record the initial water level before adding the irregular solid to ensure accurate volume measurement.
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