Fast Reactions
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Re: Fast Reactions
If the reaction is very fast, the rate changes more rapidly than the time required to measure it. The reaction may be finished before an initial rate can be observed.
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Re: Fast Reactions
A reaction can only proceed as quickly as its slowest intermediate/elementary step. Therefore, fast reactions move towards equilibrium quickly and do not affect the progress of the slow step.
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Re: Fast Reactions
Think of it like a bottleneck. The slowest step is what determines the rate, because the reaction can't get any slower (it can get faster, but what we want is the maximum amount of reactant change possible which comes with the slowest step). The slowest step is the rate determining step.
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Re: Fast Reactions
Because the slowest step is the rate determining step, in the sense that it is able to be measured within a time interval, fast reactions are not included in rate laws.
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