Question detail
Which statement best describes evaporation?
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. It occurs only at the boiling point
- B. It happens at the surface of a liquid
- C. It requires a temperature increase
- D. It is a chemical change
Answer
The correct answer is It happens at the surface of a liquid.
Explanation
Application lens: Apply the rule to the specific sample or situation instead of reciting a broad fact. This question asks: Which statement best describes evaporation. The correct response is It happens at the surface of a liquid, because changes of state are explained by particle energy and arrangement. In Changes of state, the marking point should connect directly to state that changes of state are physical changes. 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 175 is distinct because it uses this exact question context and the application lens rather than a generic particle-model sentence.
Common mistake
Misunderstanding Physical Changes
Students often confuse physical changes with chemical changes, thinking that changes of state involve new substances being formed.
Emphasize that changes of state, such as melting or freezing, do not create new substances; the material retains its original properties.
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