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Rates of Reaction Investigation Introduction In this investigation I am going to investigate how fast the chemicals Hydrochloric Acid and Sodium Thiosulphate react. The four main variables that affect rate are: o Temperature - if the reactants are heated/cooled they have more/less energy. If they have more energy there is greater chances of successful collisions meaning the reaction occurs faster. o Concentration - if the solution is more concentrated there are more reactants there is a greater chance of successful collisions. o Surface Area - if one reactant has more surface area there is greater chance of a successful collision as there is more area for the reaction to occur on. o Catalysts - a catalyst is a chemical that speeds up a reaction without changing itself during the reaction. An example of this is an enzyme. In this investigation however I am only going to investigate how concentration affects rate of reaction as the other...

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