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Empirical formula lesson with questions and answers. Includes combustion analysis problems and converting molecular formula to empirical formula. A level and GCSE chemistry suitable. 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 thumbnail image)
Slide 3 – Definition of empirical formula and example of how to convert molecular formula to empirical formula
Slide 4 – Independent practice: converting molecular formula to empirical formula. Answers animate onto the screen
Slide 5 – Worked example 1 - Calculating empirical formula from experimental data. This is the question in the slide: A sample of a compound contains 1.27 g of copper and 0.16 g of oxygen. Calculate the empirical formula. Live model on white board. Answer is Cu2O
Slides 6 – Worked example 2 (harder question)
Slide 7 – Worked example 3 (harder still)
Slide 8 – Introduction to the following experiment: Reduction of copper(II) oxide. Students are asked to write down the chemical and symbol equation for the reaction. Answers animate onto the screen
Slide 9 – Students will now be guided through the process of finding the empirical formula of the copper oxide. On this slide, they are given the data obtained from the experiment. Which subtractions must they make to find the mass of copper? Answers animate onto the screen
Slide 10 – Which subtractions must they make to find the mass of oxygen? Answers animate onto the screen
Slide 11 – Students will now be shown how to work out the empirical formula of the copper oxide using the masses of copper and oxygen which they calculated
Slides 12 - 14 Calculation using combustion analysis – worked example. Students will be shown step-by-step with animations, how to first find the mass of carbon, then the mass of hydrogen and finally the mass of oxygen. From here, the empirical formula calculation is a piece of cake.
Slide 15 – Mini plenary question on combustion analysis
Slide 16 – Answer to mini plenary animates onto the screen
Slides 17 – 21 - Exam questions with answers that animate onto the screen (all included with this resource)

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