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What is electrophilic addition? What is the mechanism for electrophilic addition? What is Markovnikov’s rule for asymmetric alkenes? What is an electrophile? 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 – Explanation of electrophilic addition and electrophiles
Slides 4 – 7: A walkthrough with animated commentary of the mechanism for the electrophilic addition of hydrogen bromide with ethene. Students are encouraged to follow the stages on a mini whiteboard, and then copy the complete mechanism into their books
Slides 8 – 11: : A walkthrough with animated commentary of the mechanism for the electrophilic addition of bromine with ethene. Students are encouraged to follow the stages on a mini whiteboard, and then copy the complete mechanism into their books
Slide 12: Learning pit-stop question - Draw the mechanism for the reaction of chlorine and ethene [3]
Slide 13 – 15: Addition reaction of unsymmetrical alkenes, using propene and hydrogen iodide as the example. Slide 14 explains Markovnikov’s rule – without calling it this, since the term is not in the specification – and how the stability of carbocations dictates the major and minor product
Slides 16 – 19: learning pit-stop to check students’ learning. A series of questions of increasing difficulty, with the stretch and challenge (S+C) being the hardest. Answers animate onto the screen when you click
Slides 20 – 27: Exam questions with mark scheme answers (included with the purchase of this resource)

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