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What is entropy meaning? Why are some reactions spontaneous/feasible? Why is the entropy of a perfect crystal zero? Is diffusion an example of entropy? 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 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 – Introduction to the key term spontaneous process
Slides 4 – 6 Learning question: Why is the reaction between magnesium and oxygen spontaneous, energetically speaking?
Slides 7 – 8: Hinge question: why is the decomposition of nitrogen(V) oxide spontaneous, even though it is an endothermic reaction?
Slides 9 – 12: Entropy definition, along with diffusion and change of state as examples of entropy
Slide 13: Learning pit-stop to check students’ learning so far. There will be a series of questions on the screen for students to answer. The answers will animate onto the screen as you click
Slides 14 – 16: How does entropy change with temperature?
Slides 17 – 19: Entropy of a perfect crystal and explanation of why it is zero
Slides 20 – 27: Exam questions with mark scheme answers (included with the resource)

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