• Molecularity of a reaction is the number of molecules reacting in an elementary step.
  • A unimolecular reaction is one in which only one reacting molecule participates in the reaction.
  • Two reactant molecules collide with one another in a bimolecular reacted.
  • Termolecular reactions are relatively rare because they involve the simultaneous collision of three molecules in the correct orientation, a rare event.
  • Another reaction involves the conversion of ozone (O3) to oxygen (O2) with ultraviolet light.
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