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Types of catalysis (homogeneous, heterogeneous and autocatalysis) with focus on Haber process. Absorption, reaction and desorption are addressed in this lesson. 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)
Slide 3 – definition of adsorption and autocatalysis
Slides 4 – 8: concept of activation energy addressed, but reframed in the context of the transition state
Slide 9 – How does a catalyst work? The link between catalysts and activation energy is explored here
Slide 10 – photo of a tunnel through a mountain. Use this slide to explain to students that a catalyst does not lower activation energy any more than the tunnel lowers the mountain; rather, it provides an alternative pathway with a lower Ea
Slides 11 – 14: difference between homogeneous and heterogeneous catalysts is explained, with examples
Slides 15 – 16: formation of the metallic / interstitial hydride during heterogeneous catalysis is explained here with a visual
Slide 17 - Three steps in catalysis involving surface adsorption is explained here (adsorption, reaction and desorption)
Slide 18 – Mini plenary (learning pit-stop). 3 mark exam question. The little angels should answer in their exercise books or you can print the question for them using slides 19 – 20. Answer animates onto the board when you are ready to reveal.
Slides 19 – 20: printable format of exam question mini plenary
Slides 21 – 25: autocatalysis, using reaction of ethanedioic acid and potassium manganate(VII).
Slides 26 – 31: Exam questions with mark scheme answers (included as a word document with this resource)

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