Question detail
What is the rate-determining step in a reaction mechanism?
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 fastest step in the reaction
- B. The step that has the highest activation energy
- C. The step that determines the overall rate of the reaction
- D. The step that produces the most products
Answer
The step that determines the overall rate of the reaction
Explanation
The rate-determining step is the slowest step in a reaction mechanism that controls the rate of the overall reaction. It is crucial for understanding how the reaction proceeds, as it dictates how quickly reactants are converted into products, unlike other steps that may occur more rapidly.
Common mistake
Distinguishing Overall Equation from Rate-Determining Step
Students often confuse the overall equation of a reaction with the rate-determining step, thinking they are the same.
The overall equation represents the complete reaction, while the rate-determining step is the slowest step that limits the rate of the entire reaction. To distinguish them, identify the step that has the highest activation energy or the one that occurs last in the mechanism. Understanding this difference is crucial for analyzing reaction mechanisms accurately.
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