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Paper 2
Organic Chemistry
Both
Alkanes: single bonds (CnH2n+2). Alkenes: double bond (CnH2n).
Key Facts
- Complete combustion produces CO2 and water.
- Crude oil is separated by fractional distillation.
Topics Covered
Alkanes and Alkenes
What you need to know
- •Alkanes are saturated; alkenes are unsaturated.
- •Alkenes decolourise bromine water.
Exam Tips
- Use general formulae to identify series.
Polymers
What you need to know
- •Addition polymerisation uses alkenes.
- •Repeat units show how monomers join.
Exam Tips
- Show brackets and n in polymer structures.
Alcohols and Carboxylic Acids
What you need to know
- •Ethanol is made by fermentation or hydration of ethene.
- •Carboxylic acids are weak acids.
Exam Tips
- State conditions: yeast for fermentation.
Key Terms
Saturated
Only single bonds between carbon atoms.
Unsaturated
Contains one or more double bonds.
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Common Exam Questions
How do you test for an alkene?
2 markseasyPaper 2
Model Answer
Add bromine water; it changes from orange to colorless.
What examiners want to see
- ✓Name bromine water.
- ✓State color change.
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