Investigation into the Factors that Affect the Enthalpy Change During a

Investigation into the Factors that Affect the Enthalpy Change During a shifting Reaction The Task -------- To investigate the factors affecting the enthalpy change during a fault reaction. Background Knowledge ==================== In this investigation a displacement reaction impart be notice. A displacement reaction occurs when more than reactive metal displaces, (or removes) a less reactive metal from a solution of its salt. Also known as chemical bullying because a more reactive metal effectively bullies the original metal forbidden of its compound. In this investigation zinc and pig sulphate will be reacted together. Zinc is the more reactive metal here, so the copper is displaced from the copper sulphate solution. Zinc + slovenly person sulphate Zinc sulphate + Copper Zn (s) + CuSO4 (aq) ZnSO4 (aq) + Cu (s) After the reaction it will be observed that the solution will change from blue to clear, colourless. The copper discharged wil l be observed as a salmon pink stupefy in the base of the vessel the reaction occurs in. Reactions like this can be used to purify metals that are low down in the responsiveness series. A more reactive metal can simply be added to purify the less reactive metal, leaving it in its slight state. hint Oxide + Tin Lead + Tin Oxide In reality thought this appoint for is hardly ever used, as the more reactive metal is the left field in an impure form, and thus must(prenominal) be reduced by an even more reactive metal. As this is not economically possible metals are generally reduced using electrolysis, which leaves them in a pure state, and requires no expensive more reactive metals, just... ...pacity of the solution (assume this equals 4.2 J/g/degrees Celsius), /T = temperature change (estimated from extrapolation). The results here show the heat nada in to each one reaction. To calculate the enthalpy change one must account for the respective mo les involved in each reaction. To equal proscribed the number of moles simply multiply the results by the respective amounts required to make them all amounts of Joules/1 mole. When this calculation is performed on all the heat null results enthalpy change can be compared. In an accurate try the enthalpy change when copper sulphate solution is reacted with zinc disintegrate should remain constant. By taking into account the number of moles in each equation when multiplying the results will be brought into proportion, so the enthalpy changes should be nearly equal.