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Cambridge IGCSE Chemistry (0620/0971)
Chapter 11 - Organic chemistry
Topic 11.5 - Alkenes
For exams from 2025 (core and extended)

As always this video follows the Cambridge syllabus exactly and contains absolutely everything you need to know for your final exam!

Other lessons in this chapter:
11.1 - Formulae, functional groups and terminology:    • IGCSE Chemistry - Formulae, functional gro...  
11.2 - Naming organic compounds: https://www.patreon.com/posts/igcse-c...
11.3 - Fuels:    • IGCSE Chemistry - Fuels (11.3)  
11.4 - Alkanes: https://www.patreon.com/posts/igcse-c...
11.6 - Alcohols: https://www.patreon.com/posts/igcse-c...
11.7 - Carboxylic acids:    • IGCSE Chemistry - Carboxylic acids (11.7)  
11.8 - Polymers: https://www.patreon.com/posts/igcse-c...

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Timestamps:
0:00 Intro
0:32 Alkenes
1:05 Cracking
1:42 Reasons for cracking
2:00 Hydrocarbon saturation test
2:25 Addition reactions (extended)
2:46 Properties of alkenes (extended)

Core content:
1) State that the bonding in alkenes includes a double carbon–carbon covalent bond and that alkenes are unsaturated hydrocarbons
2) Describe the manufacture of alkenes and hydrogen by the cracking of larger alkane molecules using a high temperature and a catalyst
3) Describe the reasons for the cracking of larger alkane molecules
4) Describe the test to distinguish between saturated and unsaturated hydrocarbons by their reaction with aqueous bromine

Extended content:
5) State that in an addition reaction only one product is formed
6) Describe the properties of alkenes in terms of addition reactions with:
(a) bromine or aqueous bromine
(b) hydrogen in the presence of a nickel catalyst
(c) steam in the presence of an acid catalyst
and draw the structural or displayed formulae of the products