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Decomposition reaction with heat: AB ⟶ A + B, where heat (ΔH) is included in the reactants or products. Decomposition reaction with light: 2A ⟶ A + A, where light is supplied as a reactant causing the molecule A to decompose into two separate molecules of A. Decomposition reaction with electricity: 2AB ⟶ A + B, where electricity is applied to break down the compound AB into its elemental components A and B.
Heating mercury(II) oxide (HgO) will cause it to decompose into mercury and oxygen gas. The chemical reaction is as follows: 2HgO(s) -> 2Hg(l) + O2(g)
The reaction between zinc and phenol can be represented by the following equation: Zn(s) + 2C6H5OH(l) → Zn(C6H5O)2(s) + H2(g)
You can use in chemical reactions symbols as (s), (l), (g).
This is not a decomposition reaction.