You would imagine chemical processes to be irreversible, irreversibly converting one component into another. Even though this is sometimes true, some chemical processes allow us to take the end products and change them back into the starting materials. These reversible reactions have the potential to attain "equilibrium" under specific circumstances.
To start, let's define equilibrium. We will only have the reactants at the start of a reversible reaction when it is occurring in a closed system, which is one in which no substances are being added or removed. Immediately after the reaction begins, the levels of the amounts of the reactants will start to drop, while those of the products will start to rise. This would be the end of the story in a non-reversible reaction, but in reversible reactions, the products can also react to create the reactants once more.
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