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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)

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