Balance chemical equations
Move coefficients, count every atom and make matter balance on both sides.
Scientific learning path
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- 04ObserveLive
- 05ExplainLive
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1 H2+1 O2→1 H2O
The atom ledger updates instantly as each coefficient changes.
Set the coefficients
Description of this simulation
H already matches. O has 2 atoms before the arrow and 1 atom after it. Change coefficients, never subscripts.
Live atom ledger
Level 1- H22
- O21
What this reaction does
Hydrogen combustion forms water and releases heat. A hydrogen fuel cell also consumes hydrogen and oxygen, but converts chemical energy electrochemically into electrical work; electrolysis is the non-spontaneous reverse process driven by electrical energy.
The rule that never changes
Change only the large coefficient before a formula. Changing a subscript changes the substance itself, so the simulator keeps every formula locked.
What this model shows — and what it simplifies
Educational ModelEach formula is parsed into its element counts, then multiplied by its coefficient.
Where do we see this in real life?
Chemical plants use balanced equations to decide feed rates and predict product yield. From ammonia fertiliser to rocket propellant, an incorrect coefficient means wasted material, unsafe conditions or the wrong product quantity.