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Get ready for Year 13 with our three-day A Level Chemistry Summer Refresher Courses. Students will review key Year 12 material, strengthen their understanding of core concepts and tackle any gaps before their final A Level year begins. AQA courses run on 18th–20th August and 26th–28th August. OCR (A) courses run on 26th–28th August. Book now!

The videos below are from the YouTube channels MaChemGuy and Mr C Dunkley. Subscribe to keep up to date with the latest videos.

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Oxidation Number 1

This video explains what an oxidation number is and the rules involved in working the oxidation number of a certain element.

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Oxidation Number 2

This video provides more examples to show how the rules of working out the oxidation number are used.

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Redox Reactions (looking at electrons)

This video explains what a redox reaction is in terms of loss or gain electrons and gives examples of reaction explaining where the oxidation and reaction takes place.

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Redox Reactions (looking at oxidation number)

This video explains how one can determine the oxidation and reduction taking place in a redox reaction using oxidation numbers.

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