GCSE Chemistry – Cracking & Alkenes – Catalytic & Steam Cracking | Equations (2026/27 exams)

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*** WHAT’S COVERED ***
1. The process of cracking long-chain hydrocarbons.
* Why long-chain alkanes are broken down into more useful, shorter-chain molecules.
2. Cracking as a thermal decomposition reaction.
3. The two main methods of cracking.
* Catalytic cracking, which uses a hot catalyst.
* Steam cracking, which uses high temperatures and steam.
4. How to write balanced chemical equations for cracking reactions.
* Cracking a long-chain alkane produces a shorter alkane and an alkene.
5. An introduction to alkenes as an unsaturated homologous series.
* The difference between saturated alkanes (single bonds) and unsaturated alkenes (double bonds).
6. Key properties and uses of alkenes.
* The chemical test for alkenes using bromine water.
* The use of alkenes in the production of polymers.

*** CHAPTERS ***
0:00 Introduction
0:55 What is Cracking?
1:18 Types of Cracking
2:18 Balanced Equations for Cracking
3:36 Worked Example
4:55 Alkenes
5:32 Properties of Alkenes

*** PLAYLISTS ***

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