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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) If you have a positive experience with the resource please leave a positive review! This really helps promote our store! Thanks!

What makes a reaction feasible or spontaneous? How do you calculate entropy change of system, entropy change of surroundings and entropy change of the universe? 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) Slides 3 – 6: Introduction to total entropy change, including definitions and visuals for entropy change of system and entropy change of surroundings Slides 4 – 6 Learning question: Why is the reaction between magnesium and oxygen spontaneous, energetically speaking? Slide 7 – Introduction of new knowledge that forms the bedrock of the lesson: For a reaction to be spontaneous, Δ𝑆𝑡𝑜𝑡𝑎𝑙 must be positive Slides 8 – 17: Entropy change of system. There are two worked examples (with printout slides included) for you to go through with the students. The answers animate onto the screen as you click. Slides 18 – 20: Mini plenary (Learning pit-stop). A set of questions for students to practise calculating entropy change of system. Answers animate as you click! Slides 21 – 29: Entropy change of surroundings and total entropy change. There are two worked examples (with printout slides included) for you to go through with the students. The last example gives students an opportunity to calculate the total entropy change. The answers animate onto the screen as you click. Slides 30 – 33: Word fill exercise about entropy change of system, surroundings and total entropy change. Answers animate onto the screen as you click. Slide 34 – Which temperature does a reaction become feasible? Slides 35 – 38 (hidden in slideshow mode): Using the Gibbs’ equation to work out feasibility. Teach at your discretion – this approach is allowed to work out the temperature at which a reaction becomes feasible, but it is not a requirement for the International A level Slides 39 - 41: Using T = ΔH÷ΔS_system to work out the temperature of feasibility Slides 42 – 44: Mini plenary (Learning pit-stop). A set of questions for students to practise calculating temperature of feasibility. Answers animate as you click! Slide 45 – consideration of thermodynamic and kinetic stability Slides 46 – 51: Exam questions with mark scheme answers (included with the resource) If you have a positive experience with the resource please leave a positive review! This really helps promote our store! Thanks!

Can entropy changes explain the solubility of group 2 hydroxides and sulfates? Which entropy changes occur when a solid ionic lattice dissolves? Or there is a change of state? 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) Slides 3 – 8: Reactions involving a change of state, starting with ammonium carbonate and ethanoic acid, followed by magnesium and oxygen Slides 9 – 10: Y12 recap of what happens when an ionic solid dissolves in water Slide 11: Hinge question – why are some ionic solids insoluble in water? Slide 12 – introduction to the equation needed to calculate the total entropy change for an ionic solid Slides 13 – 15: Worked example 1, which shows students how to use data to show why silver chloride is insoluble in water at 298 K Slide 16 - Mini plenary (Learning pit-stop). A set of questions for students to have some independent practice. The questions get progressively harder. Answers animate as you click! Slides 17 – 20: Explanation of, with examples, the solubility rules of group 2 hydroxides and sulfates Slides 21 – 24: Mini plenary (Learning pit-stop). A set of questions for students to have some independent practice. The questions get progressively harder. Answers animate as you click! Slides 25 - 30: Exam questions with mark scheme answers (included with the resource) If you have a positive experience with the resource please leave a positive review! This really helps promote our store! Thanks!