This year's Additional coursework is investigating the factors that affect how quickly a reaction takes place. As part of the write-up you will need to explain why the rate of a reaction is affected by these factors. While this link from BBC Bitesize is based on a different exam board (AQA rather than OCR), it covers the basics of a reaction well: http://www.bbc.co.uk/schools/gcsebitesize/science/add_aqa/reaction/ratesrev1.shtml
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