This definitions covers Key Definitions 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 9 of 14 in this topic. Make sure you can use the exact wording confidently, because definition marks are often lost through vague language.
📖 Key Definitions
Cracking: A chemical process in which large hydrocarbon molecules are broken down into smaller, more useful molecules (including alkenes) using heat and/or a catalyst. It is a thermal decomposition reaction.
Thermal decomposition: The breakdown of a chemical compound using heat alone, without any other reactants.
Catalyst (zeolite): In catalytic cracking, zeolite is used to lower the activation energy so cracking can occur at lower temperatures and pressures, reducing energy costs.
Practice questions for Cracking (HT)
What is cracking in chemistry?
Describe the conditions used in thermal cracking and state the types of product formed.