Molecularity
The molecularity of an elementary step refers to the number of reacting particles (atoms, ions, or molecules) that must collide simultaneously to drive a chemical change.
It’s a theoretical concept that applies only to individual steps in a reaction mechanism, not the overall reaction.
Here’s how molecularity is classified:
A unimolecular elementary step involves the transformation of a single reactant particle.
Unimolecular steps typically involve internal rearrangements or bond breaking within a single molecule, making them relatively common in reaction mechanisms.
Two particles collide to produce products.
Example
Think of a bimolecular step as a handshake: it requires two participants to come into contact for the interaction to occur.
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