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How do you deduce the rate equation from the rate determining step? Or vice versa? Plus reaction mechanisms, including SN1 and SN2? This lesson includes all this, and much more! Students will learn how to deduce a reaction mechanism using the rate equation and stoichiometry. This is a Year 13 A level lesson for Edexcel International Unit 4 – WCH14, 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 of your lessons by simply changing the questions and the answers each time.
Slide 2 - Lesson objectives (see thumbnail image)
Slides 3 – 4: Introduction to the concept of rate-determining step through an analogy
Slide 5 – definition of reaction mechanism and rate-determining step
Slides 6 – 9: deducing the rate equation from the rate-determining step with two worked examples
Slide 10 – Mini plenary (learning pit-stop). Questions of increasing difficulty to check students’ learning so far. The little angels should answer in their exercise books. Answers animate onto the board when you are ready to reveal.
Slide 11 – Cheat sheet (how to recognise a catalyst and an intermediate in a reaction mechanism)
Slides 12 - 19 : deducing the rate equation from rate-determining step, with two worked examples and a mini plenary embedded
Slide 20 – Y12 recap questions on alkaline hydrolysis of halogenoalkanes
Slide 21 – sample data to compare the rate of hydrolysis of halogenoalkanes (same halogen, different structure)
Slides 22 - 26: explanation of the different rates of hydrolysis due to SN1 and SN2 mechanisms (all thoroughly explained, see preview video)
Slides 27 – 34: Exam questions with mark scheme answers (included as a word document with this resource)

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