Potable water lesson

Potable water GCSE Chemistry lesson AQA combined science, including difference between potable water and pure water, treatment of sea water and freshwater to produce potable water, with questions and answers throughout. The lesson objectives are as follows: Distinguish between potable water and pure water, describe the differences in treatment of ground water and salty water and** justify** the steps used to produce potable water.

The slides 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 importance of water and what constitutes safe, drinking water
Slide 4 - Definition of potable water presented
Slide 5 - Concept of pure water introduced (Pure water contains water molecules and no other dissolved substances). A photo of a bottle of Evian water is used as the discussion point: Is this bottle of mineral water pure? Answer animates onto screen: No, as it contains other dissolved ions, e.g. potassium, nitrates and sodium
Slide 6 - Mini plenary. 3 questions testing pupils’ understanding of the difference between potable water and pure water. Answers animate onto the screen
Slide 7 - This slide introduces the question: How is potable water produced in the UK?
Slide 8 - Steps involved to produce potable water from freshwater, including selection of appropriate source of freshwater, definition of freshwater, filter beds and sterilising with chlorine, ozone or UV
Slide 9 - Parched photo of Sahara desert to introduce the question: How is potable water obtained in countries like Saudi Arabia where there are no rivers or lakes?
Slide 10 - Steps involved to produce potable water from seawater, including desalination, distillation and reverse osmosis.
Slide 11 - Mini plenary. 4 questions testing pupils’ understanding of the steps involved in producing potable water from freshwater and seawater. Answers animate onto the screen
Slide 12-16 - Exam questions on potable water with answers animating onto the screen from the mark scheme. The last question is worth four marks, which could be useful for extended writing

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