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​To test the effect of particle size on the rate o...

Organic Reaction pathways  OCRAQAEdexcel Alip...

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Water is an odourless, colourless liquid. So are many other chemicals . Introduction Water has no obvious smell. &nbs...

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Oxygen is a  very reactive gas. It makes up a...

Introduction ​Hydrogen is a flammable gas. It burn...

Transition metals form coloured compounds OCREdexcelAQA Transition elements : properties&nbs...