Radical Reactions.

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Presentation transcript:

Radical Reactions

Starter – 6 minutes What is the difference between homolytic and heterolytic fission? (5 marks)

GCSE recap What happens when we add bromine water to an alkane? What does this tell us?

Reactions of alkanes and Halogens The reaction has 3 stages It is a substitution reaction It is also a chain reaction (we’ll see why in a bit!)

Stage 1 - Initiation This reaction needs some energy to start it off and this energy is supplied by sunlight (uv frequencies). Eg Br-Br uv 2Br• What is being formed? What type of fission is this? This process is sometimes called photodissociation. Why?

Stage 2 - Propogation Br• + CH4 HBr + •CH3 •CH3 + Br2 CH3Br + Br• Why is this a chain reaction? This stage can happen thousands of times before……….

Stage 3 = Termination When radicals meet they form a stable product. Write as many termination reactions as you can for this series of reactions