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What is a Maxwell-Boltzmann Distribution Curve and how does temperature affect reaction rate? How does concentration, surface area and pressure affect reaction rate? 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 2 – WCH12, 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: How does concentration affect rate of reaction? There is a graph to illustrate the effect of higher concentration on rate of reaction
Slides 5-6: how does pressure affect rate of reaction. There is also a slide explaining why change of pressure does not see increase rates of reaction for solids or liquids.
Slide 7-8: How does surface area affect rate of reaction, with a diagram showing the effect of low and high surface area on collision rate
Slides 9 – 12: Mini plenary exam questions (included with the resource), with mark scheme answers as animations on the slides
Slide 13 - introduction to the person of James Maxwell and his ideas relating to speeds of gas molecules
Slide 14 - explanation of how Boltzmann expanded Maxwell’s ideas using statistical mechanics
Slides 15- 20: students will be introduced to Maxwell Boltzmann distribution curves, including how to draw them, why the curve though must pass through the origin, the asymptotic nature of the curve, how to draw a curve for reaction done at a higher temperature on how to complete the shading to show that there are more molecules with energies equal to or greater than the activation energy. Print slides 17 and 18 so students can practise on pre-ready axes
Slide 21 - This is a mini white board activity. Students are asked to draw Maxwell Boltzmann distribution curves for two different solutions at different concentrations. This is not in the syllabus and is designed to be a challenge question.
Slides 22 – 28: Exam questions with mark scheme answers (included with the purchase of this resource)

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