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Reacting masses questions and answers, perfect for A level Chemistry and GCSE Chemistry. Theoretical yield calculations (needed for percentage yield). Molar ratio explained! Includes reacting masses Edexcel A level exam questions. 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 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 above)
Slide 3 – Introduction to the concept of molar ratio
Slides 4 – 8: Worked example 1 - When calcium carbonate, CaCO3, is heated, calcium oxide is formed. How much calcium oxide is produced by heating 25 g of calcium carbonate? Problem is solved using a step-by-step approach, starting with working out the moles of the substance with the known mass, deducing the moles of the substance with the unknown mass using the molar ratio and finally working out the unknown mass. All steps to the process animate on the screen in sequence.
Slides 9 – 13: Worked example 2 (same steps as worked example 1)
Slides 14 - 18 – Worked example 3 (same steps as worked example 1)
Slide 19 – Independent practice using worksheet (included)
Slide 20 – worksheet answers
Slide 21 – introduction to working out equations from reacting masses
Slides 22 - 23 – worked example 1: A 16.7 g sample of a hydrate of sodium carbonate (Na2CO3∙10H2O) is heated at a constant temperature until the reaction is complete. A mass of 3.15 g of water is obtained. What is the equation for the reaction occurring? Problem is solved using a step-by-step approach, which animates on the screen
Slides 24 - 25 – worked example 2 (same steps as worked example 1, but a harder example)
Slides 26 – 27 - Mini plenary/learning pit stop. Three questions of increasing difficulty to check students’ understanding thus far. Answers with working out animate onto the screen.
Slides 28 – 30 Exam questions with mark scheme answers (all included with this resource)

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