And you thought it was safe to go out again. No, circle theorems are not over – we’ve got to know how to prove them as well, much like many different things in Maths. And although only one is really likely to be on the exam, we’ll cover all of the proofs for the theorems that have even the slightest chance of coming up – to see these, continue reading…

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There are two types of chromatography. Today, we will be discussing paper chromatography, also known as ‘simple’ chromatography – for that very reason: it’s simple! As you may have guessed, paper chromatography is carried out on paper. Chromatography is used to separate different mixtures into their separate components – for example: you can separate inks, food colourings and dyes.

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