Use uppercase symbols and numbers (e.g., NaCl, H2SO4).
Balanced Result
Calculation Error
Chemical Equation Types
Explore common chemical reactions and balance them instantly.
Combination / Synthesis
Two or more substances combine to form one product.
H2 + O2 = H2O
2H2 + O2 = 2H2O
Decomposition
A single compound breaks down into two or more elements or new compounds.
H2O = H2 + O2
2H2O = 2H2 + O2
Single Displacement
An element reacts with a compound and takes the place of another element.
Zn + HCl = ZnCl2 + H2
Zn + 2HCl = ZnCl2 + H2
Double Displacement
Two compounds react, and the ions of the two reactants switch places.
AgNO3 + NaCl = AgCl + NaNO3
AgNO3 + NaCl = AgCl + NaNO3
Combustion
A substance reacts with oxygen gas, releasing energy in the form of light and heat.
CH4 + O2 = CO2 + H2O
CH4 + 2O2 = CO2 + 2H2O
Acid + Base / Neutralization
An acid and a base react to form a salt and water.
H2SO4 + NaOH = Na2SO4 + H2O
H2SO4 + 2NaOH = Na2SO4 + 2H2O
Redox
A reaction involving the transfer of electrons between two species.
Fe + O2 = Fe2O3
4Fe + 3O2 = 2Fe2O3
Metal + Acid
A reactive metal displaces hydrogen from an acid.
Mg + HCl = MgCl2 + H2
Mg + 2HCl = MgCl2 + H2
Metal + Water
A metal reacts with water to produce a metal hydroxide and hydrogen gas.
Na + H2O = NaOH + H2
2Na + 2H2O = 2NaOH + H2
Precipitation
Two aqueous solutions combine to form a solid precipitate.
BaCl2 + Na2SO4 = BaSO4 + NaCl
BaCl2 + Na2SO4 = BaSO4 + 2NaCl