Question detail
If the initial rate of a reaction is found to be proportional to the square of the concentration of reactant B, what is the order of reaction with respect to B?
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
2
Explanation
The evidence indicates that the initial rate is proportional to the square of the concentration of B. This means that if the concentration of B is doubled, the rate increases by a factor of four. The implication is that the reaction rate depends on the concentration of B squared, leading to the conclusion that the order of reaction with respect to B is 2.
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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