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Science Coursework: Rates of Reaction Skill section P Aim: To investigate the effects of temperature on the reaction between sodium thiosulphate and hydrochloric acid. Scientific Knowledge: Reaction: When atoms or groups of atoms re-arrange resulting in the change of molecular structure in substances, is only possible when the particles collide with the other reactants with enough energy to form the transition state and change it into other products. Without such circumstances reaction will not be possible. This is collision theory. The factors that affect the rate of reaction are: - Temperature - Pressure - Size of surface area in which reaction will take place - The concentration of reactants The reaction will take effect faster if any of these are increased. That is all because of collision theory. Reactants also need to have sufficient energy, activation energy, to react. If increasing temperature, the reactants will vibrate more making it more likely for them to collide...

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