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January 2002 Michael Lavery U5W Chemistry Coursework - Investigation of Energy Changes in a Displacement Reaction. Plan Introduction When a metal is added to a solution of another salt metal the reaction between the two brings about an exothermic reaction. In this investigation I aim to discover, as the mass of zinc increases, when energy given out stops rising i.e. how much zinc can react with 50cm3 of 0.5M Copper Sulphate. The reaction is exothermic because energy given out when bonds are made is greater than the energy taken in to break bonds. Zinc + Copper Sulphate ? Zinc Sulphate + Copper ? ? (metal) (metal salt) Zn (s) + CuSO4 (aq) ? ZnSO4 (aq) + Cu (s) Variables The only variable I will alter throughout the experiment is the mass of zinc used; altering only one variable keeps the test fair. I will keep the following variables constant: Volume of copper sulphate used (50cm3) and the concentration of copper sulphate (0.5M) Method Apparatus * Large...

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