Why does the slowest step considered a rate determining step of the reaction?

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Solution

This is because the slowest step requires more time to happen... as there can be several other processes involved in completion. One example is that a reactant may need to diffuse or migrate to a specific reaction site before another reaction can take place which then produces a product instantly. Reactions are termed as an order (1st order, 2nd order, 3rd order) depending on the rate at which they progress.

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