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What equation is right when burning when heating copper carbonate.

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Introduction

Lewisham 31-10-2003 College Candidate name: Roland Lucien Ewas Ambassa Assessor: Bernice Ferdinand Science investigation for OCR coursework Chemistry coursework: TITLE What equation is right when burning when heating copper carbonate INTRODUCTION Basic copper carbonate occurs in nature as the mineral malachite (CuCO3) it can be synthesised in the laboratory regardless of its source, basic copper carbonate has the same composition (CuCO3). Copper carbonate is a green powder. When heated it decomposes to give a black colour of copper oxide and the reaction releases carbon dioxide. When it is heated, CuCO3 splits up or decomposes. When one substance splits up into two or more on heating, this is called "thermal decomposition". The carbon dioxide gas formed is lost to the air or collected, so the copper carbonate loses mass the copper oxide formed weighs less than the copper carbonate. However, the mass of copper carbonate equals the total mass of the copper oxide and carbon dioxide because the same atoms are present but in different ways. WHEN ONE SUBSTANCE SPLITS UP INTO TWO OR MORE ON HEATING, WE CALL THIS 'THERMAL DECOMPOSITION' AIM The aim of this investigation is to determine which equation metal carbonate form when it is heated. We will achieve this by heating the metal carbonate then look at the colour of the product formed, working out the mass of the two products if they are equal to the heated mass of copper carconate and investigating the volume of gas evolved. ...read more.

Middle

APPARATUS - Gas Syringe - Bunsen Burner - Heat Mat - 2 Clamp Stands - Boiling Tubes - Bung & Piping - Bigital balance - Spatula - pouder of copper carbonate - weight bohle - goggle - lab coat DIAGRAM METHOD step 1: Firstly, I set up the clamp stands, gas syringe and bunsen burner as shown in the diagram. Step 2: Using a digital balance, weight the tong and record it mass (T) it and add with accuracy 0.4 g of metal carbonate. Step 3: Pour the pouder in the boiling tube making sure that there is no rest in the weight bohle or minimase lost of the pouder as possible as it is. Step 4: Connect the boiling tube and the gas syringe with bung &piping then hold both the syringe and the boiling tube with the clamp stands Step 5� Turn on the gas and light the Bunsen burner. burn until all the metal is turned black Step 6: Check when the volume of gas releaved stop increase turn thefire off and record the volume of gas this volume should be accurately recorded to minimise reading errors. Step 7: remove the burg from the boiling tube after cooling it, weight the remaining black product. This mass is very important because it will also help me to find if the mass of copper carbonate equals mass of the two products formed. ...read more.

Conclusion

My preliminary experiment shown me that it was the equation 1 But to finaly decide this I have to check if the mass of CuCO3 equals the sum of mass of (CO2 and CuO) m1 = 0.4g m2 =0.258g V1 m V1 m1 n3 = = = Vo Mco2 Vo Mco2 V1 x Mco2 So m1 = Vo 0.077 x 44 m1 = = 0.141g 24 CONCLUSION m1 + m2 = 0.141g+ 0.258g = 0.399g this is slightly 40, which is the mass of CuCO3 used. so my prediction was right the mass of the reactant equals the sum of product. The correct Equation is CuCO3(s) CuO(s) + CO2(g). RISK ASSESSEMENT To make sure that this investigation is a safe one the following safety procedures have to be followed. � When the Bunsen burner is not being used it should be put on a yellow flame. This is the safety flame and is visible and cooler � If a test tube cracks or melts turn off the Bunsen burner and stop the investigation immediately. � Always wear safety goggles. � If you can smell gas turn all of the gas taps off immediately. � Pull the delivery tube out of the cylinder before you stop heating. . Wear a lab coat, as copper carbonate is corrosive . Avoid contact between the delivery tube, which is made of rubber and fire, as smoke of burning rubber might be suffocant. ...read more.

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