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"What effect does changing the temperature have on the rate of reaction?"  

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"What effect does changing the temperature have on the rate of reaction?" Aim: I am going to produce a piece of coursework investigating the rates of reaction, and the effect different changes have on them. I have chosen to investigate the effects temperature has on a reaction. This is because it is the most practical thing to experiment. and I am already familiar with the chemicals hydrochloric acid and sodium thiosulphate. Fair test: In order for my findings to be as accurate as possible the experiment must be fair. I will use the same stop watch each time for judging when the "X" has disappeared. I will make sure that the measuring cylinders for the hydrochloric acid and the sodium thiosulphate will not be mixed up. The amount of hydrochloric acid will be fixed at 5cm3, the sodium thiosulphate at 10cm3 and the distilled water at 40cm3 each time. All these precautions will...

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