Reversible Reaction vs Irreversible Reaction — Difference (with Table & FAQs)
Reversible Reaction vs Irreversible Reaction — a 6-row comparison table, 4 key points and 3 exam FAQs. Class 10 Chemistry.
TL;DR: Reversible Reaction vs Irreversible Reaction — a 6-row comparison table, 4 key points and 3 exam FAQs. Class 10 Chemistry.
Written & reviewed by the Syllab.in Academic Team (CBSE/NCERT subject experts) · Updated
The main difference between Reversible Reaction and Irreversible Reaction: A reversible reaction is one where products can react with each other to reform reactants and the reaction can proceed in both directions. An irreversible
Reversible Reaction vs Irreversible Reaction — Comparison Table
| Basis | Reversible Reaction | Irreversible Reaction |
|---|---|---|
| Definition | Reaction that can proceed both directions | Reaction that proceeds in one direction only |
| Direction | Forward and backward reactions occur | Only forward reaction occurs |
| Equilibrium | Reaches chemical equilibrium | Goes to completion |
| Products | Products can form reactants again | Products cannot reform reactants |
| Example | A2 + B2 <=> 2AB | CH4 + 2O2 => CO2 + 2H2O |
| Representation | Shown with <=> symbol | Shown with => symbol |
Key Points
- Reversible reactions reach equilibrium where forward and backward rates are equal
- Irreversible reactions go to completion with reactants fully converted to products
- Most chemical reactions are reversible but some conditions prevent reverse reaction
- Temperature, pressure, and concentration affect the equilibrium position of reversible reactions
Frequently Asked Questions
What is the difference between a reversible and an irreversible reaction?
In a reversible reaction the products can react together to re-form the original reactants, so the reaction proceeds in both directions. In an irreversible reaction the products do not react back, so it proceeds essentially in one direction only.
How is a reversible reaction shown in an equation?
With a double half-arrow pointing both ways between reactants and products, rather than the single arrow used for an irreversible reaction.
What is equilibrium in a reversible reaction?
When the forward and backward reactions occur at the same rate, the amounts of reactants and products stop changing. This is dynamic equilibrium: both reactions are still going on, but at equal rates, so the concentrations remain constant.