top picks
Rates of reaction cartoon (BBC Bitesize)
Watch the cartoon and follow the instructions to learn about rates of reaction.

Rates of reaction (s-cool)
Follow the links to concise revision notes on rates of reaction, then have a go at the multiple choice questions and exam style questions.

Rates of reaction video (BBC Bitesize)
Watch the video to remind yourself about the different ways to speed up a chemical reaction.

Endothermic and exothermic reactions - Bitesize video
Watch this short video clip to help you to understand exothermic and endothermic reactions.

Rates of reaction - Bitesize video
Watch this video to help you to revise the effect of concentration, particle size, temperature and catalysts on the rate of reaction. Then practise your collision theory explanations!

Reversible reactions and equilibria - Bitesize
Read through these pages to revise what you have learned about reversible reactions and the contact process.

Exothermic and endothermic reactions (s-cool)
Read through the text and watch the animation to learn how bonds are broken and made in chemical reactions and how this determines the energy change.

YouTube - Ri Christmas Lectures 2012
Watch some of these video clips to see some amazing chemical reactions, based on the elements and how they react.

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 immune system
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