GCSE Chemistry Revision — Hydrocarbons
Revise Hydrocarbons for GCSE Chemistry with a topic explanation, worked example and common mistakes. Check the board notes for specification differences.
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What is Hydrocarbons?
Hydrocarbons are organic compounds made up entirely of carbon and hydrogen atoms. They are the main constituents of crude oil and natural gas. They can be classified into different homologous series, such as alkanes and alkenes, based on their bonding and structure.
Board notes: Hydrocarbons are the foundation of organic chemistry. All boards expect you to know the definitions, be able to name and draw the first four alkanes and alkenes, and understand the concept of a homologous series.
Step-by-step explanationWorked examples
Worked example
Propane is a hydrocarbon with the molecular formula C₃H₈. Its displayed formula shows that each carbon atom forms four single bonds, and each hydrogen atom forms one single bond. It is an alkane.
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Common mistakes
- 1Confusing the different types of formulas used to represent hydrocarbons (molecular, structural, and displayed).
- 2Forgetting the general formulas for alkanes (CₙH₂ₙ₊₂) and alkenes (CₙH₂ₙ).
- 3Not being able to name simple hydrocarbons using the standard IUPAC naming system (e.g., meth-, eth-, prop-, but-).
Hydrocarbons exam questions
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Frequently asked questions
What is a homologous series?
A homologous series is a family of organic compounds with the same general formula, similar chemical properties, and a gradual trend in physical properties. For example, the alkanes.
What is the difference between saturated and unsaturated hydrocarbons?
Saturated hydrocarbons (alkanes) contain only single carbon-carbon bonds. Unsaturated hydrocarbons (alkenes) contain at least one carbon-carbon double or triple bond.