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An Investigation Into How the Mass of Zinc Effects the Heat Change In the Displacement Reaction Between Zinc and Copper Sulphate.

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Introduction

GCSE Chemistry An Investigation Into How the Mass of Zinc Effects the Heat Change In the Displacement Reaction Between Zinc and Copper Sulphate This investigation aims to look at how a factor can change the amount of heat produced in a displacement reaction. The displacement reaction that will occur during this experiment will be an exothermic reaction, which will mean that heat will be given out to the surroundings. The possible independent variables that could be investigated are: * The mass of zinc * The pressure of the surrounding atmosphere * The concentration of the copper sulphate * The surface area of the solid reactant, i.e. the zinc * The volume of copper sulphate * The light intensity * The pH of the copper sulphate I have chosen to vary the mass of the zinc, as it is simple and easy to measure and control. Therefore the controlled variables will be: * The concentration of the copper sulphate * The volume of the copper sulphate The dependent variable that I will be measuring, will be the temperature change of the reaction. ...read more.

Middle

21 20 34 34 13 14 13.5 25 x 4.2 x 13.5 1418 0.65 21 20 39 38 18 18 18 25 x 4.2 x 18 1890 0.8 20 21 45 42 25 21 23 25 x 4.2 x 23 2415 ANALYLSIS The shape of the graph shows us that an increase in the amount of zinc, results in an increase in the heat change. The results obtained from the line of best-fit show that that the amount of zinc (g), is directly proportional to the heat change of the reaction: * At 0.2g the heat change is 600J * At 0.4g the heat change is 1200J * At 0.6g the heat change is 1800J * At 0.8g the heat change is 2400J These results agree with my hypothesis, which is that an increase in the amount of zinc that is added to 25cm�, results in an increase in the heat change of the reaction, and this means that the obtained graph is a similar shape to my predicted graph. I also expected to see that the heat change for 0.2g of zinc would double for the heat change using 0.4g of zinc, and so the heat change would be directly proportional to the amount of zinc. ...read more.

Conclusion

* The amount of copper sulphate not being measured out exactly * The apparatus could have been dirty from the previous experiment that had just taken place, and so there could have been some extra copper sulphate solution or zinc in the cup. I think that my results are accurate as the majority of the results are close to the curve, and there is only one anomalous result. My results are therefore reliable and this is shown when they prove that an increase in the mass of the zinc resulted in an increase in the heat change of the reaction. As a good set of results has been obtained from the experiment, I think that I have chosen an appropriate range of measurements. To improve the result that were produced in a future experiment, the volume of copper sulphate solution would be measured out more precisely, the apparatus would be cleaned out more thoroughly, and the hole around the thermometer could have a seal placed around it. In order to extend this investigation I could investigate the other different independent variables, such as pressure, concentration of copper sulphate solution or volume of copper sulphate solution. ...read more.

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