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Word Count: 542
Rates of reaction between magnesium and hydrochloric acid when using different concentrations One way of making the reaction between magnesium and hydrochloric acid more effective or less effective would be to use higher or lower concentrations of either the magnesium or hydrochloric acid Temperature and surface area can also make a reaction faster or slower A catalyst can make a reaction faster without actually taking part in the reaction A high concentration makes a reaction faster A reaction is faster with high concentrations as there is more of each particle The more particles there are the higher the chance of a collision The more collisions the faster the reaction A reaction is slower with low concentrations as there is less of each particle The smaller the number of particles the lower the chance of a collision A low concentration makes a reaction slower If you have a low concentration of hydrochloric acid with a big mass of magnesium then the magnesium may not have all been broken down This is because the hydrochloric acid would have been used up If there is a small mass of magnesium with a high concentration of hydrochloric acid then when all the magnesium has been broken down there will still be hydrochloric acid leftover Aim We aim to find out if concentration effects the rate of reaction between magnesium and hydrochloric acid Prediction I predict that the higher the concentration of hydrochloric acid the faster the reaction will be I think this and have explained this more above A higher concentration increases the chance of a collision More collisions mean a faster reaction I predict that if you double the concentration of hydrochloric acid then the time taken for the magnesium to entirely breakdown will be halved I think this because twice the amount of particles will double the number of collisions Method We will use the same mass of magnesium
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