Elementary Step
| Formula / Notation | Rate = k[A]^m[B]^n; molecularity = m+n for elementary step |
|---|---|
| Also Known As | Elementary reaction, mechanistic step, rate-determining step (specific type) |
What is Elementary Step?
An individual step in a reaction mechanism that occurs in a single event at the molecular level. Elementary steps involve one, two, or rarely three molecules colliding simultaneously. The molecularity of an elementary step determines its rate law directly from stoichiometry.
Formula & Notation
Other Names / Synonyms: Elementary reaction, mechanistic step, rate-determining step (specific type)
Properties & Characteristics
Uses & Applications
Safety Information
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
Key Facts
Frequently Asked Questions
An individual step in a reaction mechanism that occurs in a single event at the molecular level. Elementary steps involve one, two, or rarely three molecules colliding simultaneously. The molecularity of an elementary step determines its rate law directly from stoichiometry.
Elementary steps are the building blocks of reaction mechanisms in kinetics. Understanding mechanisms at the level of elementary steps allows chemists to design better catalysts, predict selectivity, and propose experimental tests (isotopic labelling, stereochemistry probes).
Some elementary steps generate highly reactive, toxic, or energetic intermediates (radicals, carbenes, oxene). Understanding these helps design reactions that suppress hazardous intermediates or quickly convert them to stable products.
The formula or notation for Elementary Step is: Rate = k[A]^m[B]^n; molecularity = m+n for elementary step