| − | An '''alkene''' is a [[carbon]] based [[molecule]] where at least two of the carbon atoms in the molecule are joined by a double bond. The simplest alkene is [[ethylene]] (C<sub>2</sub>H<sub>4</sub>), which is commonly used in [[chemical engineering]] and also acts as a plant [[hormone]]. | + | An '''alkene''' is a [[carbon]] based [[molecule]] where at least two of the carbon atoms in the molecule are joined by a double bond. The simplest alkene is [[ethylene]] (C<sub>2</sub>H<sub>4</sub>), which is commonly used in [[chemical engineering]] and also acts as a plant [[hormone]]. They are also used as Monomers to form [[plastics]], such as [[poly(ethene)]] being formed from the alkene [[ethene]] (C<sub>2</sub>H<sub>4</sub>) |