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|[[File:BallandStickBut-2-ene.png|center|150px]]
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===Reactions of Alkenes===
====Combustion====
During [[combustion]] of [[alkene]]s the [[Carbon]] and [[Hydrogen]] [[atom]]s are [[oxidised]] to produce [[Carbon Dioxide]] and [[Water]].
=====Complete Combustion=====
[[Complete Combustion|Complete combustion]] occurs when there is enough [[Oxygen]] to completely [[Oxidise]] all of the [[atom]]s in the [[alkene]].
In the [[Complete Combustion|complete combustion]] of [[alkene]]s the only [[product]]s are [[Carbon Dioxide]] and [[Water]].
: [[Ethene]] + [[Oxygen]] → [[Carbon Dioxide]] + [[Water]]
: <chem>C2H4 + 3O2 -> 2CO2 + 2H2O</chem>
: [[Propene]] + [[Oxygen]] → [[Carbon Dioxide]] + [[Water]]
: <chem>2C3H6 + 9O2 -> 6CO2 + 6H2O</chem>
: [[Butene]] + [[Oxygen]] → [[Carbon Dioxide]] + [[Water]]
: <chem>C4H8 + 6O2 -> 4CO2 + 4H2O</chem>
=====Incomplete Combustion=====
[[Incomplete Combustion|Incomplete combustion]] occurs when there is not enough [[Oxygen]] to [[Oxidise]] all of the [[atom]]s in the [[alkene]].
During [[Incomplete Combustion|incomplete combustion]] of [[alkene]]s the [[product]]s may include [[Carbon]] ([[soot]]) and [[Carbon Monoxide]].
: [[Ethene]] + [[Oxygen]] → [[Carbon]] + [[Water]]
: <chem>C2H4 + O2 -> 2C + 2H2O</chem>
: [[Ethene]] + [[Oxygen]] → [[Carbon Monoxide]] + [[Water]]
: <chem>C2H4 + 2O2 -> 2CO + 2H2O</chem>
: [[Ethane]] + [[Oxygen]] → [[Carbon]] + [[Carbon Monoxide]] + [[Water]]
: <chem>2C2H4 + 3O2 -> 2C + 2CO + 4H2O</chem>