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'''Combustion reactions''' (informally known as simply ''burning'') are chemical reactions in which a substance is reacted [[exothermic]]ally with molecular [[oxygen]] (O<sub>2</sub>) at a high temperature. Combustion reactions can either be ''complete'' or ''incomplete''.<ref name="ref1">[http://www.habmigern2003.info/1_combustion.html What is combustion?]</ref>
'''Combustion reactions''' (informally known as simply ''burning'') are chemical reactions in which a substance is reacted [[exothermic]]ally with molecular [[oxygen]] (O<sub>2</sub>) at a high temperature. Combustion reactions can either be ''complete'' or ''incomplete''.<ref name="ref1">[http://www.habmigern2003.info/1_combustion.html What is combustion?]</ref>
In ideal circumstances, all reactions would be complete; or in other words, oxygen would fully [[oxidize]] the other [[reactant]]s. For example, a combustion reaction involving a [[hydrocarbon]] (any molecule consisting only of [[carbon]] and [[hydrogen]]) would result in only carbon dioxide (CO<sub>2</sub>) and and water (H<sub>2</sub>O) as products (possibly with excess oxygen). The general form of complete saturated hydrocarbon combustion is as follows:
In ideal circumstances, all reactions would be complete; or in other words, oxygen would fully [[oxidize]] the other [[reactant]]s. For example, a combustion reaction involving a [[hydrocarbon]] (any molecule consisting only of [[carbon]] and [[hydrogen]]) would result in only carbon dioxide (CO<sub>2</sub>) and water (H<sub>2</sub>O) as products (possibly with excess oxygen). The general form of complete saturated hydrocarbon combustion is as follows:
:<math>C_nH_{2n+2} + (\frac{3}{2}n + \frac{1}{2})O_2 \rightarrow nCO_2 + (n+1)H_2O</math>
:<math>C_nH_{2n+2} + (\frac{3}{2}n + \frac{1}{2})O_2 \rightarrow nCO_2 + (n+1)H_2O</math>