Explain the concept of a reversible reaction an... - SS2 Chemistry Chemical Equilibrium Question

A reversible reaction is a chemical reaction that can proceed in both the forward and reverse directions. It means that products can react with each other to form reactants, and reactants can react to form products. In a reversible reaction, there is an equilibrium state where the concentrations of reactants and products remain constant over time.

On the other hand, an irreversible reaction is a chemical reaction that proceeds in only one direction, and the conversion of reactants into products is complete. The reactants are entirely consumed, and the reaction cannot revert back to the original reactants.

Example of a reversible reaction: The Haber-Bosch process for ammonia synthesis:

N2(g) + 3H2(g) ⇌ 2NH3(g)

In this reaction, nitrogen gas (N2) and hydrogen gas (H2) react to form ammonia gas (NH3). However, ammonia can also decompose back into nitrogen and hydrogen under certain conditions.

Example of an irreversible reaction: Combustion of methane:

CH4(g) + 2O2(g) → CO2(g) + 2H2O(g)

In this reaction, methane gas (CH4) reacts with oxygen gas (O2) to form carbon dioxide (CO2) and water (H2O). The combustion of methane is an irreversible process, and it proceeds in only one direction.