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How to calculate solution concentrations in g/dm³, mol/dm³, and ppm, following the Edexcel International A Level Chemistry specification. Explains what parts per million (ppm) is and how to calculate it. 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 – diagram to represent the difference between concentrated and dilute
Slide 4 – concentration in terms of mol/dm3 and g/dm3 intro
Slide 5 – formula for molar concentration of a solution
Slide 6 – 8 Worked examples 1 -3 (answer and working out animate as you click)
Slide 9 – Mini plenary. Three questions of increasing difficulty, to check what students have learnt so far. Answers animate as you click
Slide 10 – formula to calculate mass concentration of a solution
Slide 11 - 12 - Worked example 1 -2 (answer and working out animate as you click)
Slide 13 - Mini plenary. Two questions of increasing difficulty, to check what students have learnt so far. Answers animate as you click
Slide 14 – Introduction to the concept of concentration in ppm
Slide 15 – explanation of what ppm means
Slide 16 – formula for calculations of ppm in solutions presented to students
Slides 17 – 25: Worked examples 1 -3 (answer and working out animate as you click)
Slide 26 – Mini plenary: Four questions of increasing difficulty, to check what students have learnt so far. Answers animate as you click
Slide 27 – Introduction to the term ppmv and concentrations for gases
Slide 28 – what does ppmv actually mean?
Slide 29 – formula for calculation of concentration in gases
Slides 30 – 38 – Worked examples 4 – 6 (answer and working out animate as you click)
Slides 39 – 44: Exam questions and mark scheme answers. Included with this resource as a word document but I have done a screen shot of the answers on each slide

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