Question detail
For a reaction with the rate equation Rate = k[A][B]^2, what is the order with respect to reactant 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. 1
- B. 2
- C. 3
- D. 0
Answer
2
Explanation
The order of a reaction with respect to a reactant is determined by the exponent of that reactant in the rate equation. In this case, the exponent for B is 2, indicating that the reaction is second order with respect to B.
Common mistake
Incorrect Rate Equation Prediction
Students often confuse the overall reaction equation with the rate-determining step when predicting the rate equation from a proposed mechanism.
To fix this, clearly identify the rate-determining step in the mechanism and use only the reactants involved in that step to write the rate equation. For example, if the rate-determining step is A + B → C, the rate equation would be rate = k[A][B], where k is the rate constant.
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