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See what effect changing the temperature has on the rate of reaction between sodium thiosulphate and hydrochloric acid.

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Background Collisions and reactions For a chemical reaction to occur, reactant particles must collide. * Increasing the temperature of a reaction increases the rate of a reaction. At the higher temperatures reactant particles move faster and collide more often and more violently. * Increasing the concentration of reactants increases the rate of a reaction. This is because there are more particles in the same volume so more collisions are possible every second. * Breaking up solids into smaller pieces increases reaction rate because this increases the total surface area. Increasing the surface area must increase the number of particles of the solid in contact with the other reactant in solution. * Using a catalyst increases the rate of a reaction. Catalysts are not used up in a reaction Activation energy For a chemical reaction to take place, some bonds in the reactants must be broken. The colliding particles must have enough energy to break these bonds. This minimum amount of energy is called the activation energy. Only the very fastest moving particles have enough energy to break bonds. ...read more.


Hypothesis I think that the higher the temperature of the sodium thiosulphate the larger the rate of reaction. Apparatus * Conical flask * Measuring cylinder X2 * Sodium thiosulphate * Hydrochloric acid * Kettle * Water bath at 60�c * Water bath at 80�c * Paper with cross on it * Stop clock * Thermometer * Ice Diagram Method * I will use 50ml of sodium thiosulphate * I will use 10ml of hydrochloric acid * I will start the timer as soon as the reaction starts and stops when I can not see the X because the solution is yellow. * I will do the experiment at five different temperatures. 0�,20�, 40� 60� and 80� * I will repeat the experiment five times. * I will work out the average and plot a graph. * I will wear goggles because I will be using acids. * To keep my experiment a fair test I will use the same amount of chemicals each time and make sure the same person collects it. Get the same person to time it and get another person to judge whether or not the reaction has finished or not. ...read more.


My graph is at the back of the project Evaluation. I think my experiment worked quite well and fulfilled my aim and proved my hypothesis. I think my results were accurate because during my background research I found a graph for this experiment and my graph came out similar (Unfortunately I lost the graph because there was a power cut when I was researching.). my experiment could improved by testing it again using differ chemicals and see if the graph looked the same at the end I could also try it but this time change the concentration are try it using different catalysts which are known to speed up the rate of reaction. I think the results are good enough to write a conclusion from because I repeated the experiment five times and only got one strange result and that was not that different to the rest of the results. In conclusion I think the experiment went very well and the result came out well in the end as well. If I done the experiment again I would do the experiment over one day not two because I think that is why I got that one strange result. Gcse chemistry coursework Jason overman 10/05/2007 page 1 of 4 ...read more.

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