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Chemistry rate of reaction coursework

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Introduction

Chemistry Plan I am going to produce a piece of coursework investigating the rate of reaction, selecting a variable to see how this affects the rate. The rate of reaction is the rate of loss of a reactant or the rate of formation of a product. The rate is measured by dividing one by the time the reaction took to take place. There are five factors that affect the rate of reaction: Temperature Concentration (of solution) Pressure (in gases) Surface area (of solid reactants) Catalysts I have decided to investigate the effect of concentration on the rate of reaction as I feel that it is manageable to measure, will show clear results and is much more practical than the other five variables. Both the Sodium Thiosulphate and Hydrochloric acid are soluble in water; therefore the concentration of either can be changed. However I have chosen to vary the concentration of the Sodium Thiosulphate as it is available to me in larger amounts and is more practical for my investigation. Also whilst changing the concentration it is vital that all other variables remain consistent throughout the experiment. I will not be using room temperature as I cannot control it and this could cause improbabilities within my investigation. ...read more.

Middle

25cm3, 20cm3 etc from the burette into a test tube * Next measure out the amount of water that was needed e.g. 5cm3, 10cm3 etc from the burette into a test tube. * Put both of the test tubes into a test tube rack. * Put the test tube rack into the water bath at a temperature of 40oC so the temperature doesn't affect the results as it is also a variable. * Wait ten minutes to insure that both of the substances are at 40oC. * Next take both of the substances out and put the beaker on top of the cross on a piece of paper, pour both the water and the Sodium Thiosulphate into the beaker. * Start the stopwatch once you have poured in both substances. * Look straight down the top of the beaker and you should be able to see the cross, you should stop the stopwatch when the substance becomes so cloudy that you can no longer see the cross. You should repeat this experiment for each of the concentrations that are needed varying the water and sodium Thiosulphate as you go. Diagram of experiment: My prediction If the concentration of a solution is increased there are more reactant particles per unit volume. ...read more.

Conclusion

For this to fully make sense it is necessary to recap the collision theory briefly: For a reaction to occur particles have to collide with each other. Only a small percentage of results in a reaction. This is due to the energy barrier to overcome. Only particles with enough energy to overcome the barrier will react after colliding. If the frequency of collisions is increased the rate of reaction will increase. However the percentage of successful collisions remains the same. An increase in the frequency of collisions can be achieved by increasing the concentration. So from the evidence I have collected from my investigation I can tell you that I had one outlier throughout my investigation but it was clear and so easily noticed and sufficiently removed. It is clear to me that the rest of my results are accurate as I have done three tests for each concentration this shows me that there was not to bigger range between results of the same category which assures me my results are accurate. Overall I feel that I have conducted a reliable and fair investigation. If I where to do this experiment again I would use a measuring cylinder as well as a burette to insure even more accuracy and sustain an experiment with no outliers. MATTHEW HUMPHREY 10D GCSE COURSEWORK ...read more.

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This report is of variable quality. Some aspects are well written but brief and there is not enough mention of the scientific theory behind the investigation. The data is of reasonable quality. There have been specific improvements suggested throughout.

Marked by teacher Cornelia Bruce 17/04/2013

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