

What is the test for halides? How can dilute and concentrated ammonia solution be used for halides? How do hydrogen halides react with water? 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)
Slide 3 – Reminder of the test for halides and the colours of the precipitates formed
Slides 4 – 8: explains the importance of ammonia solution to better distinguish between the different precipitates
Slide 9 – students encouraged to predict the colours of precipitates formed by fluoride and astatide
Slide 10 – Details of the reaction takes place when silver chloride dissolves in dilute ammonia solution. The same complex is formed when any silver halide reacts with ammonia solution
Slide 11 - learning pit-stop to check students’ learning. A series of questions of increasing difficulty, with the stretch and challenge (S+C) being the hardest. Answers animate onto the screen when you click
Slide 12 – How do hydrogen halides react with water? Equations with protons represented as hydronium ions are also presented to students
Slides 13 – 18: how do hydrogen halides react with water? Students can watch the embedded videos of the hydrogen chloride – ammonia experiment and use the predict-observe-model (POE) model to help them engage with the video demonstration. Alternatively, you could do the demonstration for them in class and use the POE model.
Slides 19 – 26: Exam questions with mark scheme answers (included with the purchase of this resource)
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