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Find out how much heat is given out of a displacement reaction, when using different metals.

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Introduction

Science Investigation Displacement Reaction Aim: To find out how much heat is given out of a displacement reaction, when using different metals. Background Knowledge: Displacement reaction is when one substance forces out another substance and takes it place. An example of this is when an iron nail is put in a copper sulphate solution. A displacement reaction only occurs when a metal reacts with an acid. This is an exothermic reaction. Exothermic means that the energy is going out of the reaction. Chemical reaction where the energy content of the products is less than that of the reactants; heat is given out from the system. In an exothermic reaction, heat energy is given off to the surroundings so the product molecules have lower heat content than the reactants. This is like taking a wet sponge and squeezing it into a funnel ... the sponge ends up with lower water content than before the "exothermic" reaction. ...read more.

Middle

23 23 Lead 1 2 3 Average 30 secs 21 23 22 22 60 secs 21 23 22 22 90 secs 21 23 22 22 120 secs 21 23 22 22 150 secs 21 23 22 22 180 secs 21 23 22 22 210 secs 21 23 22 22 240 secs 21 23 22 22 270 secs 21 23 22 22 300 secs 21 23 22 22 330 secs 21 23 22 22 360 secs 21 23 22 22 390 secs 21 23 22 22 420 secs 21 23 22 22 450 secs 21 23 22 22 480 secs 21 23 22 22 Aluminium 1 2 3 Average 30 secs 22 21 21 21 60 secs 22 21 21 21 90 secs 22 21 21.5 22 120 secs 22 21 21.5 22 150 secs 22 21 22 22 180 secs 22 21 22 22 210 secs 22 21 22 22 240 secs 22 21 22 22 270 secs 22 21 22 22 300 secs 22 21 22 22 330 ...read more.

Conclusion

Magnesium emitted the most heat out of them all. It took several minutes for magnesium to reach its highest temperature on the table. My prediction was correct as I predicted that Magnesium would be the metal that emitted the most heat, as it was the more reactive than the other metals. Evaluation In this experiment I investigated how much heat displacement reactions give out. We used plastic beakers but used cardboard lids, which may have altered the results of the experiment. If I were to do the same experiment over again I would use plastic lids and see if the results were the same or if they differed. We also hand stirred the solutions, so that could have changed the results. I could improve the experiment if the same person stirred it then they would know roughly at what speed they stirred the solution. Rina Bhudia Science Investigation 10 B3 Mrs Davis ...read more.

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