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What is free radical substitution? What is initiation, propagation and termination? What are the conditions for substitution reactions of alkanes and why are they not useful for organic synthesis? All this and more covered in this comprehensive lesson with questions and answers! This is a Year 12 A level lesson for Edexcel International Unit 1 – WCH11, but it can also be used for all UK exam boards. All the slides in this lesson are fully animated and include answers to every mini plenary question and exam question. The breakdown of the slides (which are best opened on Microsoft PowerPoint) is as follows:

Slide 1 - Title and 5-minute starter. The starter is a grid of four questions entitled ‘last week, last lesson, today’s learning and future learning’. Use this generic slide for all your lessons by simply changing the questions and the answers each time. The key word for the lesson, sustainable, is displayed here with the definition
Slide 2 - Lesson objectives (see thumbnail image)
Slide 3 – Recap question from Y11 content, plus a previous Y12 lesson
Slides 4 – 6: information on what a reaction mechanism is, what curly arrows are and how to use them. Print slides 5 - 6 for your students
Slides 7 - 12: worked example of free radical substitution reaction of methane and fluorine molecules. The three stages (initiation, propagation and termination) are demonstrated clearly with ink written animations
Slide 13 – details of further unwanted substitution reactions that fluoromethane can undergo. This explains why free radical sub is not useful in organic synthesis
Slide 14 – Applied Learning Time (ALT) – a worksheet, which is included with the resource, which will allow students to practise writing equations for free radical substitution
Slides 15 – 18: Answers animate on the screen as you click

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