Distinguish overall equation from rate-determining step.

In the subtopic Mechanisms and rate-determining steps (A-level only), this AQA A-Level Chemistry 7405 learning objective focuses on distinguish overall equation from rate-determining step. It belongs to Rate equations (A-level only), so revision should stay anchored to this exact subtopic rather than drifting into a generic GCSE-level chemistry summary. Approved keywords to use include rate-determining step. Rate-determining step. means the rate-determining step is the slowest step in a reaction mechanism that controls the overall reaction rate Avoid the mistake of students often confuse the overall equation of a reaction with the rate-determining step, thinking they are the same; instead, 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 For exam answers, clearly distinguish between the overall reaction equation and the rate-determining step in mechanisms