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 copper …show more content…
This means that the reaction will get twice as hot. I believe this is true, as the ratio of bond energy between the reactants and products will be the same, so as the quantity increases the difference between the energy of the reactants and products will get proportionally larger.
For example, when 1.0M copper sulphate solution is used the heat change may be 60 degrees Celsius. I believe that if this were true when a 0.5M solution was used, (half the molarity of the 1.0M solution), the temperature difference would be 30 degrees Celsius. This is half of the original value so the variables can be said to be directly proportional.
I believe that surface are will have a similar effect, (when in surplus copper sulphate solution), in that the larger the surface area to volume ratio of the Zinc the greater the enthalpy change, (as one doubles so will the other). When the surface area of the zinc is kept constant I believe that if the mass is doubled then the enthalpy change will also …show more content…
Exactly 25 cm3 of 1.0M copper sulphate solution was poured out into a measuring tube. This was placed in the polystyrene cup. Between 5.75g and 6.25g of zinc powder was then placed in a weighing boat and weighed out using a top pan electric balance. To work out the exact mass of zinc used I weighed out the mass of zinc left in the weighing boat and then subtracted this from the total weight at the first weighing.
The thermometer was placed in the solution and the stop clock was started. At precisely 3 minutes the lid was taken off the cup and all of the zinc powder was added. The lid was then replaced on the cup and the cup was stirred gently in order to ensure the reaction began, but still making sure none of the solution was spilled.
Reading were taken every 30 seconds starting from minute 0. After minute 3 the contents were stirred gently with a thermometer to unsure all the reactants had a chance to mix. Readings were taken up until minute 8 where the experiment was concluded.
Once the experiment is completed all of the equipment should be cleared away. Results should be collected and tabulated. From
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 copper …show more content…
This means that the reaction will get twice as hot. I believe this is true, as the ratio of bond energy between the reactants and products will be the same, so as the quantity increases the difference between the energy of the reactants and products will get proportionally larger.
For example, when 1.0M copper sulphate solution is used the heat change may be 60 degrees Celsius. I believe that if this were true when a 0.5M solution was used, (half the molarity of the 1.0M solution), the temperature difference would be 30 degrees Celsius. This is half of the original value so the variables can be said to be directly proportional.
I believe that surface are will have a similar effect, (when in surplus copper sulphate solution), in that the larger the surface area to volume ratio of the Zinc the greater the enthalpy change, (as one doubles so will the other). When the surface area of the zinc is kept constant I believe that if the mass is doubled then the enthalpy change will also …show more content…
Exactly 25 cm3 of 1.0M copper sulphate solution was poured out into a measuring tube. This was placed in the polystyrene cup. Between 5.75g and 6.25g of zinc powder was then placed in a weighing boat and weighed out using a top pan electric balance. To work out the exact mass of zinc used I weighed out the mass of zinc left in the weighing boat and then subtracted this from the total weight at the first weighing.
The thermometer was placed in the solution and the stop clock was started. At precisely 3 minutes the lid was taken off the cup and all of the zinc powder was added. The lid was then replaced on the cup and the cup was stirred gently in order to ensure the reaction began, but still making sure none of the solution was spilled.
Reading were taken every 30 seconds starting from minute 0. After minute 3 the contents were stirred gently with a thermometer to unsure all the reactants had a chance to mix. Readings were taken up until minute 8 where the experiment was concluded.
Once the experiment is completed all of the equipment should be cleared away. Results should be collected and tabulated. From