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Rates of Reaction Coursework "Investigating the effect of different concentrations on the rate of reaction." We will be investigating how the rate of reaction between marble chips and hydrochloric acid is affected by different concentrations of acid. CaCO3 + 2HCl CaCl2 + CO2 + H2O Variables: * Concentration * Temperature * Catalyst * Surface area The variable we have chosen to investigate is the concentration of the acid. This method has been chosen because out of the four variables, this is the most reliable. Catalysts are substances which speed up chemical reactions, but do not actually affect the experiment in any way. At the end of the experiment, the catalyst remains the same. Reactions need activation energy to start, and catalysts lower the amount of activation energy. However, measuring how much a catalyst has helped a reaction will be very difficult, as will varying it. Surface area is the other variable that will be very unreliable....

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