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Investigating energy changes during displacement reactions

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Introduction

Investigating energy changes during displacement reactions Aim To find whether the position of a metal in the reactivity series affects how much energy is released during displacement reaction. Introduction A displacement reaction is a reaction with a metal high in the reactivity series, which displaces one below it. For example, calcium could displace iron in a reaction, as it is higher in the reactivity series. (See diagram below). Potassium Most Reactive Sodium Calcium Magnesium Zinc Iron Tin Copper Least Reactive Displacement reactions are exothermic reactions, which means they give off heat when reacted. ...read more.

Middle

Apparatus 25cm copper sulphate 2g zinc (powdered) 2g iron (powdered) Measuring cylinder Thermometer Beaker Glass rod Method Measure in a measuring cylinder 25cm of copper sulphate (solution) and pour into a beaker then take the temperature of the solution with a thermometer. Then weigh 2g of iron on the scales and then add it into a beaker of copper sulphate, stir it until it dissolves. After stirring it take the temperature, and record it. Repeat this method again by using iron instead of zinc, and take the temperature before adding it to the copper sulphate. ...read more.

Conclusion

With the reaction of copper sulphate with iron, the temperature was only 33�C. This proves that a metal higher in the reactivity series gives off a bigger exothermic reaction. This means that my prediction was correct. Evaluation The experiment I think was accurate but not reliable, this is because I could have taken more replicates, so this would have given me a definite answer to my prediction. Apart from taking more replicates I would improve my experiment by timing how long I have stirred the mixture for. I would do more experiments with different metals from the reactivity series because this would prove my theory of a metal higher in the reactivity series giving off a bigger exothermic reaction. The metals I may use would be e.g. tin, magnesium, sodium and potassium. ...read more.

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