Learning objective
Explain that alkenes are unsaturated because they contain two fewer hydrogen atoms than the alkane with the same number of carbon atoms.
Read the explanation, check the common trap, then practise with flashcards and questions.
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Topic
Reactions of alkenes and alcohols (chemistry only)
Subtopic
Structure and formulae of alkenes
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Understand this objective
Quick explanation
Explain that alkenes are unsaturated because they contain two fewer hydrogen atoms than the alkane with the same number of carbon atoms
- This point belongs to Reactions of alkenes and alcohols (chemistry only), especially Structure and formulae of alkenes.
- You need to be able to explain that alkenes are unsaturated because they contain two fewer hydrogen atoms than the alkane with the same number of carbon atoms.
- The key ideas to know are alkene and unsaturated.
- Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.
Key concepts
Why it matters
This objective helps connect Structure and formulae of alkenes to exam-style questions, flashcards, and revision notes for Reactions of alkenes and alcohols (chemistry only).
Quick student answer
Why does alkenes are unsaturated because they contain two fewer hydrogen atoms than the alkane with the same number of carbon atoms?
Direct answer
In Chemistry, this page helps you answer questions about alkenes are unsaturated because they contain two fewer hydrogen atoms than the alkane with the same number of carbon atoms within Reactions of alkenes and alcohols (chemistry only). Focus on the key process, correct scientific terms, and how the idea links to exam-style questions. Key terms to check are alkene and unsaturated.
Key terms
- alkene: A hydrocarbon that contains a carbon-carbon double bond.
- unsaturated: A term describing alkenes, indicating they contain fewer hydrogen atoms than the corresponding alkane.
Common trap
Understanding Unsaturation: Emphasize that alkenes are unsaturated specifically because they contain two fewer hydrogen atoms than the corresponding alkane.
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Revision notestopic notes
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Open revision notesRelated learning objectives
- Describe alkenes as hydrocarbons with a double carbon-carbon bond.
Structure and formulae of alkenes
- State the general formula for the homologous series of alkenes as CnH2n.
Structure and formulae of alkenes
- Recall the first four members of the homologous series of alkenes as ethene, propene, butene and pentene.
Structure and formulae of alkenes
- Represent alkene molecules in displayed, structural and molecular formula forms.
Structure and formulae of alkenes
- Recognise alkenes from their names or from given formulae.
Structure and formulae of alkenes