Problem: What is the difference between a unimolecular  and a  bimolecular elementary reaction?

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We’re being asked to differentiate a unimolecular and a bimolecular elementary reaction.


Recall that an elementary step represents an actual interaction between the reactant molecules in a step. We characterize elementary steps by their molecularity.


The molecularity of a reaction is the number of reactant particles involved in the step. Here is a table showing the summary of common elementary steps.


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What is the difference between a unimolecular  and a  bimolecular elementary reaction?