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What is VSEPR theory? How can electron-pair repulsion theory be used to find the shape of a molecule and the bond angles? What is the difference between electron pair geometry and molecular shape? 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 1 – WCH11, 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 your lessons by simply changing the questions and the answers each time.
Slide 2 - Lesson objectives (see thumbnail image)
Slides 3 – 4: Explanation of VSEPR and how this theory can be used to predict the shape of a molecule
Slide 5 - A table showing all the shapes of molecule that could be encountered at A level, including the bond angles and example molecules for each shape
Slides 6 – 7: Use to print the table for your students
Slide 8 – Introduction to the rules for drawing molecules in 3D in Chemistry
Slides 9 – 16: Live modelling for the 3D drawings of a wide variety of molecules. All the important shapes are covered, including: linear, trigonal planar, tetrahedral, see-saw, T-shaped, octahedral and square pyramidal. Each molecule is accompanied by a 3D model to facilitate the drawing process. Examples of each animate on the screen as you click. Print slides 10, 12, 14 and 16, so that the students have all the 3D models for the shapes in one place.
Slides 17-19: Method for working out the shape of a molecule is presented to students. Print slides 18 – 19 for the students
Slide 20 – Worked example 1 – ammonium ion
Slide 21 - 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
Slides 22 – 23: a walk-through of S2F10, a peculiar example which I came across in past exam paper
Slide 24 – Worked example 2 – ammonia
Slide 25 – explanation of the decreased bond angles in ammonia
Slide 26 – Worked example 3 – arsenic pentafluoride
Slides 27 – 29: A walkthrough of the very challenging example that is chlorine trifluoride
Slides 30 – 41:Exam questions with mark scheme answers (included with the purchase of this resource)

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