Electrolysis Introduction with questions and answers

Electrolysis Chemistry lesson including the process of electrolysis and using electrolysis to extract metals. Lesson objectives are: define an electrolyte, explain what happens when an electric current is passed through an electrolyte and explain how electrolysis can be used to extract metals from molten compounds. 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 what happens to an ionic compound when it is melted or dissolved in water. Simple, clear, pencil-sketch diagram of beakers containing solid sodium chloride and the stages in becoming sodium ions animates on to screen
Slide 4 - Definition of electrolytes given
Slide 5 - Mini plenary. Three questions of increasing difficulty. Answers animate onto the screen
Slide 6 - Introduction to electrolysis process using example of molten sodium chloride. Simple, clear, sketch diagram of beaker with electrodes, cell, wires and molten sodium chloride. Students are shown on this slide that the electrodes are made of carbon.
Slide 7 - Explanation, with use of a diagram, of the movement of ions that take place when an electric current is passed through the molten sodium chloride, i.e. positive ions move towards the negative electrode, etc.
Slide 8 - Explanation, with use of a diagram, of what happens at each electrode, i.e. positive ions are discharged at the negative electrode, producing the element, etc.
Slide 9 - Mini plenary. Two questions of increasing difficulty. Answers animate onto the screen
Slide 10 - Introduction to reactivity series with useful mnemonic and which metals must be extracted from their ores using electrolysis
Slide 11 - Explanation as to why a lot of energy is needed to perform electrolysis of molten compounds to extract the metal
Slide 12 - Introduction to the example of extracting aluminium from aluminium oxide, including why cryolite is added to the elctrolyte
Slide 13 - Mini plenary. Pupils asked to draw a labelled diagram of the electrolysis of molten aluminium oxide
Slide 14 - Mini plenary review reveals diagram of apparatus and also explains what happens at each electrode, i.e. aluminium ions are discharged at the negative electrode, producing the element aluminium
Slide 15 - Think-pair-share based on the following question: In the electrolysis of aluminium oxide, the positive electrode must be continually replaced. Why do you think this is?
Slide 16 - Explanation, with use of diagram, as to why the positive electrode must be continually replaced.
Slide 17 -

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