Investigation into the Factors that Affect the Enthalpy Change During a Displacement Reaction

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Investigation into the Factors that Affect the Enthalpy Change During a Displacement Reaction

The Task --------

To investigate the factors affecting the enthalpy change during a displacement reaction.

Background Knowledge ====================

In this investigation a displacement reaction will be observed. A displacement reaction occurs when more 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 out of its compound.

In this investigation zinc and copper sulphate will be reacted together. Zinc is the more reactive metal here, so the
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The enthalpy change in a reaction is in effect the energy chance between the reactants and the products. If there is more energy in the bonds of the products than the amount in the bonds of the reactants then it can be seen that the reaction is endothermic. This means that it must take energy in the form of heat from its surroundings.

The opposite is also true. If the bonds between the reactants in a reaction have more energy than the bonds in the product then it can be seen that energy is given out. This takes the form of heat energy, so the reaction is said to be exothermic.

Energy is produced when bonds are formed, and energy is required when bonds are to be broken. This means that in an exothermic reaction more bonds are being formed than are being broken, oppositely in an endothermic reaction more bonds are being broken than are being formed.

To take an accurate reading of the enthalpy within a reaction, (difference in/delta H) can be found. This reading can be calculated off a graph, however it will be more accurate if the formula is used.

/\H = mc/\T

The enthalpy, (delta H) is the difference ion heat energy, in Joules, m is the mass of the solution, c is the specific heat capacity of water, and /\T is the difference in temperature.

Knowing this formula it is easy

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