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Acids and bases revision cartoon (BBC Bitesize)
Watch the cartoon to find out more about the pH scale, acids, bases and salts.

Acids and alkalis (s-cool)
Follow the links to concise revision notes on acids and alkalis, then have a go at the multiple choice questions and exam style questions.

Acids and alkalis revision video (BBC Bitesize)
Watch the video clip to refresh your knowledge about acids and alkalis, and to find out more about the pH changes that are taking place in our oceans.

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 immune system
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