This exam focus covers Exam Focus: Cracking within Cracking (HT) for GCSE Chemistry. Revise Cracking (HT) in Organic Chemistry for GCSE Chemistry with 24 exam-style questions and 0 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 12 of 14 in this topic. Treat this as a marking guide for what examiners are looking for, not just a fact list.
Topic position
Section 12 of 14
Practice
24 questions
Recall
0 flashcards
🎯 Exam Focus: Cracking
very-high Equation balancing (2-3 marks): Given a starting alkane and one product, deduce the other product using atom conservation.
high Bromine water test (2 marks): Describe the test, state the observation (orange → colourless) and conclusion (alkene present).
high Industrial reasons (2 marks): Explain the economic reason — converting low-value heavy fractions into high-value petrol and alkenes.
medium Higher tier — conditions (2 marks): Thermal = high T+P, catalytic = lower T+P + zeolite catalyst.