What characterizes a reversible reaction?

A reversible reaction is characterized by the ability of products to react and form the original reactants again. This means that both the forward and reverse reactions can occur under the right conditions, allowing the system to reach dynamic equilibrium. In such a scenario, the reactants are not permanently altered into products; instead, they can be converted back and forth.

This behavior contrasts with irreversible reactions, where the products formed cannot revert to reactants under normal conditions. While other aspects such as energy input or the nature of compounds produced may influence a chemical process, the defining feature of a reversible reaction is its capacity to allow both the forward and backward progression of a reaction.