- A combination reaction is a reaction where two reactants are combined into one product.Those reaction in which two or more elements or compounds combine magnesium oxide with carbon dioxide to produce magnesium carbonate.
A chemical formula for the reaction composition would be: A + B ------> C
This is a composition reaction: CH4 + 2O2 -----> CO2 + 2H2O
Here are some websites you can go to, to figure out more about composition:
http://chemwiki.ucdavis.edu/Analytical_Chemistry/Chemical_Reactions/Chemical_Reactions
http://chemistry.about.com/od/chemicalreactions/a/reactiontypes.htm
http://chemwiki.ucdavis.edu/Analytical_Chemistry/Chemical_Reactions/Chemical_Reactions
http://chemistry.about.com/od/chemicalreactions/a/reactiontypes.htm