1. Distinguishing Between Alkanes and Alkenes
Aim:
To investigate a way of distinguishing between an alkane and an alkene.

2. Method:
Collect apparatus
Using separate dropper for each, put 10 drops of each hydrocarbon  separate test tubes
Stopper each test tube
Note what happens

3. Results: Name of Hydrocarbon Effect on bromine water Hexane Hexene
Doesn’t decolourise bromine water
Does decolourise bromine water
Conclusion:
Bromine water can be used to distinguish between an alkane and an alkene. This is because an alkene decolourises bromine water but an alkane doesn’t.

4. Hexane with bromine water
No effect on bromine water
Hexene with bromine water
Alkenes decolourise bromine water

5. Unsaturated An unsaturated molecule contains at least one carbon to carbon double bond. Saturated A saturated molecule contains carbon to carbon single bonds only.