Chemical Reactions & Equations (C10)

Decomposition reactions require energy either in the form of heat or light or electricity for breaking down the reactants. Write one equation each for decomposition reactions where energy is supplied in the form of heat, light and electricity.

Answer

Decomposition reactions with heat

CaCO3 → CaO + CO2

2FeSO4 → Fe2O3 + SO2 + SO3

2Pb(NO3)2→ 2PbO + 4NO2 + O2

Decomposition reactions with light

2AgCl → 2Ag + Cl2

2AgBr→ 2Ag + Br2

Decomposition reactions with electricity

2H2O→ 2H2 + O2