Reagents

A reagent is a starting material for chemical reactions. Reagents are reacting materials that are formed during the reaction of products. Many chemical reactions are reversible, meaning that said materials can be regarded as either reagents or products at times, depending on the direction in which a reaction takes place. On the other hand, reagents refer to substances that are experimentally added to a mixture/solution with the intention of finding out what it is composed of, et cetera.