The Chemistry of Cracking
Part of Cracking (HT) · GCSE GCSE Chemistry revision
This deep dive covers The Chemistry of Cracking within Cracking (HT) for GCSE Chemistry. Revise Cracking (HT) in Organic Chemistry for GCSE Chemistry with 24 exam-style questions and 15 flashcards. This topic appears less often, but it can still be a useful differentiator on mixed-topic papers. It is section 2 of 14 in this topic. Use this deep dive to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 2 of 14
Practice
24 questions
Recall
15 flashcards
⚗️ The Chemistry of Cracking
Cracking breaks C-C bonds using heat and/or catalysts:
• Long alkane molecules are heated until C-C bonds break
• Random breaking produces chains of different lengths
• Some products are shorter alkanes (saturated)
• Some products are alkenes (unsaturated — contain C=C bonds)
• The process is called thermal decomposition
C₁₀H₂₂ → C₅H₁₂ + C₅H₁₀
decane → pentane + pentene
• One alkane broken into one shorter alkane + one alkene
• The alkene has a C=C double bond (unsaturated)
Keep building this topic
Read this section alongside the surrounding pages in Cracking (HT). That gives you the full topic sequence instead of a single isolated revision point.
Practice Questions for Cracking (HT)
What is cracking in chemistry?
Describe the conditions used in thermal cracking and state the types of product formed.
Quick Recall Flashcards
24 questions on Cracking (HT) — practise free
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