Question detail
A concentration-time graph shows a straight line with a negative slope. What can be inferred about the reaction order?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Rate equations (A-level only)
Question
- A. The reaction is zero-order.
- B. The reaction is first-order. (A-level cue 68b42c3b distractor 1)
- C. The reaction is second-order. (A-level cue 68b42c3b distractor 2)
- D. The reaction is third-order. (A-level cue 68b42c3b distractor 3)
Answer
The reaction is zero-order.
Explanation
The correct option is The reaction is zero-order.. The reaction is zero-order. is correct because it supports the objective: Interpret concentration-time graphs.. The reasoning stays within Rate equations and orders (A-level only) and avoids drifting into a similar A-Level Chemistry idea. This item is treated as conceptual revision rather than a formal calculation item because the validated answer is an explanation or option choice, not a worked numerical response.
Common mistake
Misinterpreting Graph Slopes
Students often misinterpret the slope of a concentration-time graph, thinking it indicates the rate of reaction directly.
The slope of a concentration-time graph represents the change in concentration over time, not the rate itself. To find the rate, calculate the gradient at a specific point on the graph.
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