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This question is about hydrocarbons - AQA - GCSE Chemistry - Question 3 - 2020 - Paper 2
Question 3
This question is about hydrocarbons. Hexane and hexene are hydrocarbons containing six carbon atoms in each molecule. Hexane is an alkane and hexene is an alkene. D... show full transcript
Worked Solution & Example Answer:This question is about hydrocarbons - AQA - GCSE Chemistry - Question 3 - 2020 - Paper 2
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Compare ethane with ethene.
Answer
Structure and Bonding
Both ethane and ethene are hydrocarbons, containing two carbon atoms each.
- Ethane has single C−C bonds, while ethene has a double C=C bond.
- Both have C−H bonds, but ethene has fewer hydrogen atoms due to the presence of the double bond.
Reactions
Both ethane and ethene combust in the presence of oxygen:
- In complete combustion, both produce water and carbon dioxide.
- In incomplete combustion, both can produce carbon monoxide and/or carbon.
- Ethene is generally more reactive than ethane, reacting with bromine water to decolourise it, while ethane does not.
Overall, while they share similarities as hydrocarbons, the presence of the double bond in ethene makes it more reactive than ethane.