

Reactions of Alkenes (Cracking & Halogens) – Lesson, Worksheet & Laboratory – Unit 4 – IGCSE Chemistry
Cracking Hydrocarbons, Bromine Addition, and Alkenes Test
This Synapse Science resource teaches students about the reactivity of alkenes and the industrial importance of cracking. Students explore how long-chain alkanes are converted to alkenes via catalytic cracking, and how alkenes react with halogens in addition reactions.
The included laboratory practical uses bromine water to distinguish alkanes and alkenes through visible colour change, reinforcing the concept of unsaturation.
TOPICS COVERED – SPECIFICATION POINTS
- 4.17: Describe how long-chain alkanes are converted to alkenes and shorter-chain alkanes by catalytic cracking
- 4.18: Explain why cracking is necessary, in terms of the balance between supply and demand for different fractions
- 4.27: Describe the reactions of alkenes with bromine to produce dibromo-alkanes
- 4.28: Describe how bromine water can be used to distinguish between an alkane and an alkene:contentReference[oaicite:0]{index=0}
WHAT’S INCLUDED
- Editable PowerPoint lesson covering cracking theory, alkene reactivity, and halogen addition
- Printable worksheet with drawing tasks, reactions, and comparison tables
- Laboratory worksheet: Bromine water test for alkenes vs alkanes
- Safety notes, teacher guidance, and structured observation table
- Scaffolded conclusion writing and reaction equation practice
KEY FEATURES
- Reinforces addition reactions and functional group testing
- Industrial relevance of cracking clearly explained
- Ideal for Triple Science (Paper 2) students
- Clean Synapse Science layout for smooth teaching and revision
KEYWORDS
Edexcel IGCSE Chemistry, Alkenes, Cracking, Hydrocarbons, Bromine Water Test, Addition Reaction, Unsaturation, Dibromoalkanes, Organic Chemistry, Synapse Science, Unit 4, Practical, Lesson, Worksheet
Something went wrong, please try again later.
This resource hasn't been reviewed yet
To ensure quality for our reviews, only customers who have purchased this resource can review it
Report this resourceto let us know if it violates our terms and conditions.
Our customer service team will review your report and will be in touch.