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Rates Of Reaction.

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Introduction

Chemistry; Rates Of Reaction Plan: This experiment is planned to investigate the rate of reaction when mixing Copper sulphate (CuSO4) with Zinc powder (Zn). My plan is to see what happens before, during and after the reaction takes place. I will need the following equipment to carry out this investigation: > A 50ml marked measuring tube > A digital precision scale > 600ml of copper sulphate > A digital thermometer > A pot of Zinc powder > A sandpaper (to sand the Copper sulphate off the thermometer) > A pen and a paper (to record results.) > A beaker (to mix the elements) > A stirring stick For the first preliminary results chart, the variable will be the amount of Zinc powder but the copper sulphate solution will be 30 ml. Step-by-step: In order to get satisfactory results out of this experiment, you'll have to follow carefully the step-by-step instructions: i. Put a light plastic recipient on a digital precision scale. ...read more.

Middle

The result stagnates because of the fact that there aren't enough copper sulphate molecules, which can't react with the overdose of zinc powder. This is shown by the graph above. The zinc ratio is getting higher than the CuSO4. In the next result chart the quantity of zinc powder will be 6g and the variable will be the amount of copper sulphate to see if the results will rise or lower. Quantity of Zinc powder (g) Amount of copper sulphate (ml) Temperature (degrees C) Time (secs) 6 30 67 60 6 60 65 60 6 90 56 60 6 120 51.6 60 The second chart of results shows that the more copper sulphate solution is added with only 6g of Zinc powder, the temperature falls very slowly, bit by bit. This time, the copper sulphate ratio is getting bigger than the Zinc. Prediction: I believe that as the amount of zinc powder increases, the temperature after the reaction will be greater, therefore the temperature change will be greater. ...read more.

Conclusion

I have also learned from the preliminaries that as you keep the zinc amount level and vary the amount of Copper Sulphate, the more Copper Sulphate there is, the less the temperature after. I think this is because there is to much Copper Sulphate trying to mix with a small amount of Zinc, and as such, not much energy is needed to make the 2 chemicals react, so less heat is given out. If I were to do the experiment again, I may well decide to explore what happens when you keep the zinc amount level and vary the amount of Copper Sulphate. This is because I would like to know whether the reactions kept getting colder, or weather they curve off as you get more Copper Sulphate. I would do this experiment because then I would be able to understand what happens in the reaction, Zn(s) + CuSO4 (aq) Cu(s) + ZnSO4 (aq). I would like to know whether my preliminaries were wrong, and that the temperature wasn't supposed to decrease. Morgan Richardson Page 1 ...read more.

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