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Chemistry coursework. Aim. The aim of my investigation is to find out if the concentration of acid effects reaction rate. Plan. I plan to keep all variables the same but I will change the concentration of acid. I will measure the amount of gas given off and will also time how long it takes for the gas to be given off. I will take a measurement of how much gas is given off every 10 seconds and record the results on a graph to compare how much the concentration of acid effects the rate of reaction. Prediction. I predict that as the concentration of the hydrochloric acid increases, the time taken for the magnesium to disappear decreases. I predict that when the concentration of the hydrochloric acid doubles, the rate of the reaction doubles. Theory. The collision theory describes how the rate of reaction increases (the time taken for the magnesium ribbon to disappear when it is reacted...

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