Question detail
In an experiment, the initial rate of reaction doubles when the concentration of reactant A is doubled. What is the order of reaction with respect to A?
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. 0
- B. 1
- C. 2
- D. 3
Answer
1
Explanation
The evidence shows that doubling the concentration of A results in a doubling of the initial rate. This indicates a first-order reaction with respect to A, as the rate is directly proportional to the concentration. The implication is that the reaction rate depends linearly on the concentration of A, leading to the conclusion that the order of reaction is 1.
Common mistake
Misunderstanding Reaction Orders
Students often confuse the order of reaction with the stoichiometric coefficients in the balanced equation.
To fix this, students should focus on how the initial rate data is used to determine the order of reaction, which may not directly correspond to the coefficients in the balanced equation.
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