Reaction Balancer
A chemical reaction rearranges atoms but does not create or destroy them, so a correct equation has the same number of each kind of atom before and after the reaction.
ChemistryAges 11-13~9 min🎙️ Voice tutor
Play freeNo account needed
What your child will figure out
- Count each type of atom on both sides of a chemical equation and identify mismatches.
- Balance equations by changing coefficients that count whole molecules, without changing formula subscripts.
- Predict when an equation is balanced and justify the prediction with visible atom counts.
- Transfer conservation of atoms to balance a novel methane-combustion equation.
The levels
- Atom audit
Count H and Cl before and after a reaction and use the mismatch as evidence that the equation is not balanced.
- Coefficient control
Balance sodium chloride by adding whole molecules while keeping formula subscripts fixed.
- Water works
Balance water formation while tracking both hydrogen and oxygen counts.
- Combustion transfer
Apply conservation of atoms to the novel methane-combustion equation.
Ready when they are.
Play Reaction Balancer free — no account, no card.
Play Reaction Balancer free