So if we're given an unbalanced one, we know how to get to the balanced point, balanced chemical equation. So it's a relationship, the reactants and products in a balanced chemical equation. But for our purposes a reagent and a reactant is the same thing. The reagents are sometimes for special types of reactions where you wanna throw a reagent in and see if something happens, and see if your belief about that substance is true or things like that.
They're both the reactants in a reaction. For most of really our purposes, you can use the word reagents and reactants interchangeably. "Stoichiometry is the calculation of quantitative, "or measurable, relationships of the reactants "and the products," and you're gonna see in chemistry sometimes people use the word "reagents".
This is the actual definition that Wikipedia gives. This is an ultra-fancy word that often makes people think it's difficult, but it really is just the study or the calculation of the relationships between the different molecules in a reaction. Now we're ready to learn about stoichiometry. We know what a chemical equation is, and we've learned how to balance it.
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