

Homogeneous catalysis and heterogeneous catalysis. Homogeneous catalysis mechanism. Iodide and persulphate ions. Examples of homogeneous catalysts? All this and more covered in this comprehensive lesson with questions and answers! This is a Year 13 A level lesson for Edexcel International Unit 5 – WCH15, 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.
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.
Slide 2 - Lesson objectives (see thumbnail image)
Slide 3 – definition of homogeneous catalysts
Slide 4 – how do homogeneous catalysts work?
Slide 5 – this slide explains the catalysis of the reaction between iodide and persulfate ions
Slide 6 – an alternative mechanism with iron(III) as a catalyst
Slide 7 – definition of autocatalysis
Slide 8 – an example of autocatalysis (ethanedioate ions by an acidified potassium manganate(VII)
Slide 9 – concentration-time graph for the reaction between mangante(II) ions and ethanedioate ions
Slides 10 – 11: hidden slides of the graph which you can print for your students
Slide 12 - learning pit stop questions to test students’ understanding so far. Answers animate on the screen when you click
Slides 13 – 14: nitrogen oxides act as a catalyst for the formation of acid rain. This section explains how with clear, chemical equations
Slides 15 – 24: exam questions with mark scheme answers included with this resource
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