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Which equation is correct - The aim of this experiment is to prove whether Copper carbonate decomposes into copper 2 oxide or copper oxide when heated.

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Introduction

Which equation is correct The aim of this experiment is to prove whether Copper carbonate decomposes into copper 2 oxide or copper oxide when heated. The equations which include these oxides are: 2CuCO3(s) Cu2O(s) 2CO2 1/2O2(g) 2CuO3(s) CuO(s) CO2(g) To work out which equation is correct I will use mole calculations to work out the amount of gas produced and then I will carry out the experiment and measure the amount of gas given off then compare the results. If the amount of gas collected is similar to the amount of gas calculated in either equation, I will know the equation is correct. In the experiment I will ensure a fair test by keeping the following points constant when repeating the experiment * The amount of CuCO3 used * The position of the flame to the boiling tube and the position of the air hole cover on the Bunsen burner. I will weigh the CuCO3 each experiment to make sure it is the same weight as in the previous experiments. I will set the clamp holding the boiling tube to a fixed position and I will not move it, just unscrew the holder to empty the boiling tube when the experiment has finished. ...read more.

Middle

The gas is made up from small enough particles that can pass through the wool, preventing the larger particles of the powder from entering the gas syringe and displacing the air. I have seen the experiment and noticed that the CuCO3 started bubbling when it was heated. The bubbling is caused by gas escaping through the powder. The bubbling stops (the gas stops releasing) the reaction is over. From this observation I know to read the amount of gas given off after the bubbling has stopped. When programming the experiment onto "Crocodile Chemistry", I noticed that the syringe moved inwards when the reaction was over. This was because at the start of the experiment there is air in the delivery tube and boiling tube. When the air is heated it expands. After that apparatus cooled down the air then contracted. What was left in the gas syringe was the gas released from the reaction. I will leave the apparatus to cool down to room temperature before I read off the gas collected when doing the experiment. ...read more.

Conclusion

weight the calculated amount * Weigh the rock sill wool and record and place in boiling tube * Attach boiling tube to clamp and set to an angle as illustrated on the diagram * Place bung into boiling tube * Make sure the valve on the Bunsen burner is fully opened * Lit the Bunsen burner * Wait until the CuCO3 has stopped bubbling * Turn Bunsen burner off * Leave to cool to room temperature for about 5 minutes * Read off volume of gas collected * Reweigh the boiling tube and contents and minus the weight of the boiling tube and rock sill wool to get the weight of the CuCO3 * Calculate the actual volume of gas produced to r.t.p. using the following equation: P1 ? V1 P2 ? V2 = T1 T2 Rearrange to give: P1 V1 V2 = ? T2 T1 P2 * repeat this whole method two more times and work out the average amount of gas collected * If he average volume of gas collected is near to 60.7 cm3, equation 1 is correct and if the volume of gas is nearer to 47.5cm3, equation 2 is correct. ...read more.

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