chemistry aid please?

[andre a]

Write a balanced equation for a real example of each of the following types of reactions:

a) Metathesis

b) Decomposition

c) Combustion

[Gerald L]

http://en.wikipedia.org/wiki/Metathesis_reaction

Metathesis is a bimolecular process involving the exchange of bonds between the two reacting chemical species, which results in the creation of products with similar or identical bonding affiliations.[1] To illustrate, consider two chemical species, AB and CD, which react to give AD and CB:
AB + CD -> AD + CB

Chemical decomposition or analysis is the separation of a chemical compound into elements or smaller compounds
The generalized reaction formula for chemical decomposition is:
AB -> A + B


Combustion or burning is a complex sequence of exothermic chemical reactions between a fuel and an oxidant accompanied by the production of heat or both heat and light in the form of either a glow or flames.
In a complete combustion reaction, a compound reacts with an oxidizing element, such as oxygen or fluorine, and the products are compounds of each element in the fuel with the oxidizing element. For example:
CH4 + 2O2 -> CO2 + 2H2O