The aim of my investigation is to find out the effect of temperature on the rate of reaction.

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The Disappearing Cross

Background Information

        

        Sodium thiosulphate Na2S2O3 reacts with hydrochloric acid HCl as follows.

Word equation

Sodium     + Hydrochloric  -> sodium chloride +                  

Thiosulphate     acid            sulphur + sulphur                                                      

        Dioxide + water

Balanced Equation

Na2S2O3 + 2HCl(aq)  ->   2NaCl(aq) + S(s) + SO2(g) +

                                           H2O(l)

      When the reactants are mixed together the solution becomes cloudy because sulphur is precipitate. As the precipitate gets thicker, ink cross of a piece of paper below the flask disappears. The aim of this investigation is to study in detail the effect of a variable on the rates of reactions.

Aims

       The aim of my investigation is to find out the effect of temperature on the rate of reaction.

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Prediction

       I predict that as temperature increases the rate of reaction will also increase. I think this is because the particles will have more energy and more collisions will occur.

Scientific Knowledge

       Components affecting rates of reaction are temperature, whether a catalyst is used, the surface area, and concentration of acids. The higher the temperature the quicker the rate of reaction will be and vice versa.

       Temperature is the factor I will be investigating for this experiment for my coursework. When ...

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