Question detail
When interpreting a graph of temperature against time during a phase change, what does a horizontal line indicate?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Mathematical requirements and assessment objectives
Question
- A. The substance is undergoing a phase change
- B. The substance is cooling down
- C. The substance is heating up
- D. The substance is at a constant temperature
Answer
The substance is undergoing a phase change
Explanation
The correct option is The substance is undergoing a phase change. The substance is undergoing a phase change is the best answer because it directly supports the AQA A-Level Chemistry objective to plot, interpret and analyse graphs. This reasoning is anchored to Mathematical requirements in Mathematical requirements and assessment objectives, and it separates graph from similar A-Level ideas rather than relying on a vague recall statement. Other options are weaker if they use the wrong evidence, calculation, mechanism, observation, unit, or conclusion for this subtopic.
Common mistake
Misinterpreting Graph Slopes
Students often confuse the slope of a graph with the y-intercept, leading to incorrect interpretations of data trends.
Focus on understanding that the slope represents the rate of change between the variables plotted on the axes, while the y-intercept indicates the value of the dependent variable when the independent variable is zero.
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