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Investigate a factor that effects the change in temperature between iron and copper sulphate.

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Introduction

Investigate a factor that effects the change in temperature between iron and copper sulphate. Victoria Wright 11t In this investigation I am going to investigate a factor that effects the change in temperature between copper sulphate solution and iron filings. The variable involved in this investigation are: � The volume of copper sulphate � The mass of iron filings added � Rise in temperature � Concentration of the copper sulphate In this in investigation my input variable that I am going to change will be the mass of iron filings that I will place into the copper sulphate solution to see how the change in mass effects the rise in temperature of the solution. My prediction for this investigation is that as I increase the mass of iron filings the greater the change in temperature. However, there will be a point where, when I increase the mass of iron filings, the change in temperature will be about the same as it was with the mass of iron filings before it as there will not be enough copper molecules to react with the iron. My scientific reason for my prediction; the greater the mass of iron filings; the greater the rise in temperature, is that a displacement reaction will take place between the iron and the copper. Iron is higher in the reactivity series of metals than copper, and a more reactive metal will displace a less reactive metal from its compound. The list (left) shows that iron is more reactive than copper. The iron replaces the copper and becomes iron sulphate: Iron + Copper Iron + Copper Sulphate Sulphate Fe + CuSO4 FeSO4 + Cu This will result in an exothermic reaction, which will give us the rise in temperature of the solution. ...read more.

Middle

Plan To carry out this investigation I will carry out the below plan. � Collect all the apparatus listed overleaf and place them on a clean surface. � Place all 5 boiling tubes in the rack, measure out 10ml of copper sulphate solution and carefully pour it into each boiling tube. � Measure out the five different masses of iron filings carefully, using a spatula not to pick up iron filings with your hands. � Measure the starting temperature of the copper sulphate solution, it doesn't matter if it is different each time as you will take away the maximum temperature from the starting temperature. � Wind up the stop clock and get one person to start it as the other pours in the iron filings. Stir the iron filings with the thermometer carefully. � Every minute for four minutes check the temperature and record it. In between the readings make note of the observation that can be seen, smelt, felt etc. � After the four minutes stop the timer and place the boiling tube back in the rack. Repeat this for the next four masses of iron filings. � When the experiment is finished pour the contents of the boiling tubes in a container so it can be disposed of and wash the other apparatus. � Repeat this experiment twice again. Analysis From my graph, overleaf it can be seen that as the mass of iron filings increases; the rise in temperature increases. The reason for this being that a chemical reaction takes place between the iron and the copper sulphate. This is a displacement reaction between the copper and iron. A metal will displace a less reactive metal in a metal salt solution like the one in this experiment this can be seen in the equation below. ...read more.

Conclusion

However the disadvantage of this would be as there is twice as much solution than before so it would take twice as long to see the maximum increase in temperature. Further investigations For a further investigation I would do this experiment again either using an element that is higher than iron in the reactivity series or lower than copper to show that the displacement would not take place. I would carry out the investigation in the same way as I did this investigation taking in to account the changes that I stated above. My prediction would be if I used an element like aluminium, which is higher in the reactivity series, than iron; as the amount of aluminium is increased the temperature will increase, I would however expect a larger increase in temperature than with iron, as the element is more reactive. I could also do an investigation like this one but just using 20ml of copper sulphate instead of 10ml. The investigation would follow the same principle plan as this investigation. By using a higher volume of copper sulphate I will know that there will be enough copper molecules to react with all the iron giving maximum temperature increase. However, as the volume will be higher it will take longer for all of the molecules to react with each other, I predict, as I would be doubling the volume of copper sulphate from this investigation it would take double the time to see the maximum temperature change. The graph would show that the increase in iron is proportional to the rise in temperature for all readings as there would be enough copper to react with the amount of iron added for all the readings. ...read more.

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