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Aim: the aim of the investigation is to find out the rates of reactions of magnesium with different concentrations of hydrochloric acid. Prediction: I predict that the magnesium will displace hydrogen, as magnesium is more reactive (higher in the reactivity series) than hydrogen (lower in the reactivity series). This in turn will form magnesium chloride. But the different concentrations of acid will affect the speed of the reactions. The higher the concentration the more particles of acid there are, causing them to collide more frequently than the lower concentration, which has less particles of acid. Concluding that the higher concentration will collide with the substance more often, making the reaction faster. Also that the lower concentration will collide with the substance less often, making the reaction slower, than the higher one. The same idea of "it is quicker to dig a hole with 10 men than 1 man digging it by...

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