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Alkenes - GCSE Chemistry Definition

Reviewed by: Philippa Platt

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Alkenes are a group of hydrocarbons that contain at least one carbon-carbon double bond, making them unsaturated compounds. Their general formula is CnH2n, where "n" is the number of carbon atoms in the molecule.

Unlike alkanes, which only have single bonds, the presence of a C=C double bond in alkenes gives them unique properties and makes them more reactive. This reactivity allows alkenes to undergo various chemical reactions, such as addition reactions, which are important in the production of polymers and other chemicals.

Key examples of alkenes include:

  • ethene (C2H4)

  • propene (C3H6)

  • butene (C4H8)

They are often used in industries to manufacture plastics and other materials. Understanding alkenes is essential for GCSE Chemistry students as it illustrates the diversity and reactivity of different types of hydrocarbons.

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Philippa Platt

Reviewer: Philippa Platt

Expertise: Chemistry Content Creator

Philippa has worked as a GCSE and A level chemistry teacher and tutor for over thirteen years. She studied chemistry and sport science at Loughborough University graduating in 2007 having also completed her PGCE in science. Throughout her time as a teacher she was incharge of a boarding house for five years and coached many teams in a variety of sports. When not producing resources with the chemistry team, Philippa enjoys being active outside with her young family and is a very keen gardener

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