Question

What is a Reversible reaction?

Answer 1

Changes are a random or uncertain phenomenon that can be good or bad. A chemical change is a chemical reaction in which one or more substances are altered to produce new substances or structures. There are two types of changes- Reversible and Irreversible.

Complete answer:
A reversible reaction is one in which the reactants and products react together to return the reactants to their original state. In simple terms, it is a reaction that involves the simultaneous conversion of reactants to products and vice versa.
The main feature of this reaction is that the reactants and products are never completely exhausted. That is to say, they are constantly reacting and producing. The following is an example of a reversible reaction:
$X + Y \rightleftharpoons N + Z$
X and Y can react to form N and Z, and N and Z can react to form X and Y in the opposite reaction. The reversible chemical reaction is indicated by the double arrow.
The reacting molecules collide and cause chemical reactions in a closed system in most cases. When the products are formed, the bonds between the molecules are broken when they collide, generating enough energy to break the bonds between the product and reactant molecules further. In both directions, reversible reactions may not occur at the same rate. Nonetheless, a state of equilibrium is reached. This is also dependent on the initial reactant and product concentrations, as well as the equilibrium constant, K.
In essence, the most important concept to grasp here is that the products can be converted back into the reactants.

Note:
In the year 1803, Claude Louis Berthollet, a French chemist, proposed the concept of a reversible reaction for the first time. After observing the formation of sodium carbonate crystals in an Egyptian salt lake, he came to this conclusion.
$2NaCl + CaC{O_3} \rightleftharpoons N{a_2}C{O_3} + CaC{l_2}$
He claimed that the excess salt in the lake aided the "reverse" reaction, which resulted in the production of sodium carbonate.