Everything about Elementary Reaction totally explained
An
elementary reaction is a
chemical reaction in which one or more
chemical species react directly to form products in a single
reaction step and with a single
transition state.
In a
unimolecular elementary reaction a
molecule, A,
dissociates or
isomerises to form the products(s).
»
This rate expression can be derived from first principles by using
collision theory.
The rate expression for an elementary bimolecular reaction is sometimes referred to as the
Law of Mass Action as it was first proposed by Guldberg and Waage in 1864. An example of this type of reaction is a
cycloaddition reaction.
Three chemical species must react simultaneously with each other in a trimolecular elementary reactions. It follows that such reactions are very rare.
Any chemical reaction can be broken down into a set of elementary reactions. It isn't always possible to derive an overall
rate equation for non-trivial reaction schemes, but analytical solutions are possible in favourable cases, see, for example, the
steady state approximation or
Michaelis-Menten kinetics for
enzyme-based reactions.
Further Information
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