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Relationship Between the Masses of Copper Carbonate and Copper Oxide

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Introduction

Relationship Between the Masses of Copper Carbonate and Copper Oxide Kyal Mepham-Roberts Aim I plan to investigate the relationship between the masses of copper oxide and copper carbonate when the latter is heated. Mass is a fundamental property of matter and each element has it's own atomic mass number corresponding to the total number of protons and neutrons in the nucleus of a single atom of that element. However, for the purposes of this experiment we will be using the term "mass" to mean weight in grams. In this investigation I will heat different amounts of copper carbonate and see how its mass corresponds to that of copper oxide. Prediction My prediction is that as the amount of copper carbonate used in each experiment increase, so will the mass, and this will directly correspond to a steady increase in the mass of copper oxide. ...read more.

Middle

+ CO2 (g) When heating the copper carbonate in the test tube it is essential that it be shaken gently throughout the reaction. This will enable the copper carbonate to be heated evenly. Also any excess gas will be able to escape where necessary. It will be easy to judge when the reaction has taken place as the colour of the substance will have changed from the light green of copper carbonate to the black of copper oxide. It is at this point that we will weigh the copper oxide and notify the result. Results The results for the masses of both copper carbonate and copper oxide are below: Mass of copper carbonate Mass of copper oxide Change in mass 5g 4.4g -0.6g 10g 7.6g -2.4g 15g 11.7g -3.3g 20g 16.6g -3.4g 25g 20.8g -4.2g 30g 26.7g -4.7g Analysis of results From the results in the table and the graph ...read more.

Conclusion

If interpreted literally this would mean that when the mass of the copper carbonate was 0g then the mass of the copper oxide would be 0.967g! Evaluation Although the results generally agree with the theory that the mass of copper carbonate has a relationship with the mass of copper oxide, but as the graph shows the results are not entirely accurate. There are several different solutions for this: 1. We could have controlled factors in the investigation better (e.g. the shaking of the copper carbonate whilst it is heated, because if this is not done properly it can lead to incorrect results). 2. We could have conducted all six experiments on the same day, as such factors as temperature and humidity can change. Which would alter the outcome of the reaction. 3. We could have conducted more than experiments, which would create more detailed results and the graph's line of best fit would be more accurate. * I calculated this using linear regression using the statistics software SPSS. ...read more.

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