Reactions to decomposition are the reverse of combination reactions.

The decomposition reaction is also the break in two or more components of a compound.Another type of redox reaction is one in which an element replaces or displaces another from a compound.In these reactions, known as single replacement reactions, the element which replaces that which is in a compound is always oxidized.

The element being displaced, is always reduced.A redox reaction is a chemical reaction that involves a transfer of electrons between two species.  Oxidation numbers are used by chemists to keep track of electrons within a compound. A combination reaction  is a reaction where two or more elements combine A combustion reaction where a compound and an oxidant is reacted to produce heat and a new product. Displacement reaction is a chemical reaction in which a more reactive element displaces a less reactive element from its compound.Decomposition reactions involves breaking down a compound into smaller compounds or individual elements.