Question

The number of molecules that react with each other in an elementary reaction is a measure of the:

• A. activation energy of the reaction
• B. stoichiometry of the reaction
• C. molecularity of the reaction
• D. order of the reaction

Hint:

Molecularity is the number of reactant molecules that collide in an elementary step to undergo a reaction.

Answer 1

The Correct Option is C

The quantity representing the number of molecules colliding and reacting in a single step of a chemical process is known as the molecularity of the reaction.

1. Definition of Elementary Reactions:
An elementary reaction is a fundamental chemical transformation that occurs in one step, involving direct collision and reaction of reactant molecules to form products. The count of molecules participating in this singular event determines a key attribute of the reaction.

2. Terminology:
This count of reacting molecules in an elementary reaction is termed molecularity. Molecularity classifies the reaction as unimolecular (involving one molecule), bimolecular (involving two molecules), or termolecular (involving three molecules).

Conclusion:
The number of molecules reacting together in an elementary reaction quantifies its molecularity.