• In a decomposition reaction, a single compound breaks down into two or more simpler substances.

• In a displacement reaction, one element replaces another in a compound, resulting in a new element and a new compound.

• A decomposition reaction involves only one reactant that breaks down.

• A displacement reaction involves two reactants: one element and one compound. (in single displacement, double displacement has two compounds as reactants)

• An example of a decomposition reaction:

         \(\rm 2H_{2}O\) → \(\rm 2H_{2}\)+ \(\rm O_{2}\) 

• An example of displacement reaction(single):

       \(\rm Zn\)+\(\rm CuSO_{4}\) → \(\rm ZnSO_{4}\)+\(\rm Cu\)