Question

What is the starting substance in a chemical reaction?

Answer 1

`"The reactant..."`

Explanation:

Generally we consider chemical reactions on the basis of ....

`"Reactant"rarr"product"`...i.e. the products are on the right hand side as we face the page. And some reactions are in equilibrium, where the reaction does not go to completion, and equilibrium quantities of product and reactant are present...

`"Reactants"rightleftharpoons"products"`

As always `K_"eq"="Concentration of products"/"Concentration of reactants"`