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Factors that can affect the rate of chemical reactions include: purity, concentration, contact area of the reactants, temperature and pressure.
To increase reaction rate, increase concentration, contact area (by grinding the reactant into small pieces), temperature and/or pressure. But note that in the case of purity it is difficult to tell whether high or low purity will lead to a faster reaction rate, because sometimes a contaminant can speed up the reaction, while sometimes it will slow the reaction down. It depends on the nature of the contaminant.
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