Definition - What does Reagent mean?

Reagent is a compound or a substance that is added to a system to initiate a chemical reaction or to see whether or not a reaction takes place. Reagents are used in chemical reactions to measure, detect, produce or examine other substances. They are mixtures or compounds in organic chemistry that are composed of small organic or inorganic molecules causing transformation on an organic substrate. When preparing or purchasing a chemical, the reagent grade defines the chemical substances with sufficient purity to be used in chemical reactions and analysis or physical testing.

Petropedia explains Reagent

Reagent and reactant are terms which are most often used interchangeably. A reactant is a chemical substance used in creating a reaction after combining with other substances. Reagents are of two types, i.e., limiting reagents and excess reagents. Limiting reagents are the reactants that are completely used up in reactions and hence they determine when reactions stop. Excess reagents are the reactants that are not completely used up in the reactions, which mean that some of the reactants are left unused. Limiting reagents are totally consumed in reactions and limit the reactions to continue as nothing is left to react with in excess reactants.

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