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Which equation is correct - Equation 1: 2CuCo3(s) ® Cu2O(s) + 2Co2 (g) + 1/2O2(g)Equation 2:CuCo3(s) ® CuO(s) + Co2(g)

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Introduction

Lewisham College Zahra Hussien As chemistry Assessor: Bernice Ferdinand Science investigation for OCR coursework As chemistry Title Which equation is correct? Introduction Copper carbonate can be exist in two forms; one is azurite is also known as basic copper carbonate and it is blue in colour, the other form of copper carbonate is called malachite and it has a distinctive green colour. The copper oxide that I used for my experiment is malachite. It is formed by action of carbon dioxide and water on copper sulphides or by action of copper solution on calcite. It is a hydrous carbonate of copper. Aim The aim of this investigation is determine which equation is correct. We need to decide what is given off after caring the experiment. We will do this by heating the copper oxide and look at the colour change after heating it. We need to calculate if the mass of copper oxide and the volume of gas given off from our investigation are equal to the hated mass of copper carbonate. ...read more.

Middle

3. Heat it gently using Bunsen burner. 4. Observe the colour change. I carry out the experiment after I saw the copper carbonate change from green to black. 5. I set up the clamp stands, gas syringe and Bunsen burner as shown in the diagram. 6. Weigh 0.4g of copper carbonate and transfer it into the boiling tube. 7. Fix the boiling tube and the gas syringe in to two different stands shown in the figure above. 8. Close the boiling tube with bung and connect the boiling tube and syringe by delivery tube. 9. Turn on the gas and light the Bunsen burner and heat the copper carbonate in the boiling tube. Keeps burning till all the metal turns black and the volume of carbon dioxide in the syringe stops moving. 10. Record the final volume of carbon dioxide. 11. After the boiling tube cold down remove the bang from the boiling tube and measure the mass of the black product we get after burning copper carbonate. ...read more.

Conclusion

* transfer error, when I transfer the copper carbonate into the boiling tube. * Measurement error. * Errors of transferring the black powder from the boiling tube. * Calculation error. * I was expecting to get 0.077dm3 of gas from the experiment but I get 0.061dm3 . in this case I get less volume of gas than I should be getting. This error might be due to one or two of the following reasons: * I took the final volume before the copper carbonate burns completely. * Problems of fixing the bung into the boiling tube. * From the above preliminary experimental result I got, I can say that equation 1 is correct. To confirm that the mass of copper carbonate I used in the beginning of the experiment has to be equal to the total mass of copper oxide and the volume of carbon dioxide. CuCO3(s) ? CuO(s) + CO2(ga) n3 = n1 Vo = m1 = m2 V3 M1 M2 > m3 = n3 x M3 m3 = 0.0032 x 44 m3 = 0.1408g > m1 = m2 + m3 m1 = 0.258g + 0.1408g m1 = 0. ...read more.

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