Given the task definition and input, reply with output. Given a scientific question and its correct answer, generate supporting facts for the answer. This supporting fact can be an explanation for the answer to the given question.

Question: In a chemical reaction, the amounts of reactants and products will be constant when what state is attained? Answer: equilibrium
The amount of reactants and products do not have to be equal. However, after equilibrium is attained, the amounts of reactants and products will be constant.