• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month
  1. 1
  2. 2
  3. 3
  4. 4
  5. 5
  6. 6
  7. 7
  8. 8
  9. 9

Investigation of energy changes in a displacement reaction

Extracts from this document...


Investigation of energy changes in a displacement reaction


The theory that I am looking at is that:

‘A more reactive metal will displace a less reactive metal from a compound’

The reaction that I will be looking at is zinc replacing copper. This happens, as zinc is higher in the reactivity series than copper. The ionic equation is shown below:

Zn(s) + Cu2+(aq) → Cu(s) + Zn2+(aq)

With any reaction with a more reactive metal, displacement occurs.


To make a prediction for this investigation, certain aspects of energy changes need to be looked into first:

Displacement reactions

Displacement reactions are type of redox reaction. These are reactions where a more reactive metal will replace a less reactive metal in a salt.

E.g. Zinc + Lead Nitrate → Zinc Nitrate + Lead

As zinc is more reactive, it replaces lead in the salt

Oxidation-reduction reactions, redox reactions, are an important part of this experiment. In an oxidation reaction, a product will gain oxygen ions and will loose electrons. In a reduction reaction, a product will loose oxygen ions and gain electrons. In the following example, copper reacts with oxygen ions to form copper oxide.

2Cu + O2 → 2CuO

The copper atoms are converted into copper ions Cu2+ in the reaction and the oxygen is converted into oxygen ions, O2-. The copper has lost electrons:

Cu → Cu2+ + 2 electrons

...read more.




  • Polystyrene Cup
  • Beaker
  • Mercury Thermometer
  • Zinc (Chosen Masses)
  • Copper Sulphate (0.5M, 50cm3 at a time)
  • Measuring cylinder
  • Electronic weighing scales
  • Spatula
  • Goggles
  • Lab coat



  • Lab coat and goggles are put on
  • Polystyrene Cup is placed in the glass beaker
  • 50cm3 of copper sulphate is measured out and poured into the cup. The temperature of the copper sulphate is then taken and noted.
  • Zinc is measured out on electronic weighing scales and is added to copper sulphate
  • The copper sulphate and zinc are then stirred. When the reacting has stopped, the temperature is noted.
  • This process is repeated for the values every 0.25g from 0.25g to 3.0g. My values have gone past the maximum value to show the graph straightening out.


To make this experiment a fair test, certain variables need to be kept the same. The same person needs to be kept the same, so that the reaction speed is kept the same. Also, 50cm3 of copper sulphate needs to kept the same all the way through also, so that the reaction with the zinc will be fair. The 50cm3 measuring cylinder will have to be used, as the same error margin will be the same.

...read more.


  • Using a lid on the cup to keep the heat in
  • Using electronic scales which weigh to more than one decimal place to make the weighing more accurate
  • Using an electronic thermometer will increase the accuracy of the temperature measurement
  • Using a pipette or burette instead of a measuring cylinder will increase the accuracy of the measuring of the copper sulphate

The results I have found are reliable as the graphs match what was expected. The results have also been reproduced throughout the experiment.


My conclusion to this experiment is that it was fair and accurate method. It gave reliable results and the apparatus provided gave accurate results. However, these results can be improved further if:

  • More repartitions of the experiment were done. This would provide more results and add to the evidence for the experiment and also increase accuracy
  • The experiment was tried with different metals, ones that are at different levels in the reactivity series. This would be done to see how the use of different reactions change the temperature and energy changes and if the theory still works with different metals. Also, using salts with a metal lower in the reactivity series than the base can show whether distance in the reactivity series affects the energy change.
  • Different concentrations of the salt were used. This can also show the difference between the temperature and energy changes
  • Data logging could be used so that there is now chance in human error in the experiment

...read more.

This student written piece of work is one of many that can be found in our GCSE Electricity and Magnetism section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Electricity and Magnetism essays

  1. Peer reviewed

    electomagnet lab

    3 star(s)

    and the suspended electromagnet is very small. This is so that the filings get attracted more easily to the electromagnet. 11. After checking and re-checking that everything has been set up correctly, the power supply must be turned on for two minutes. 12. The electromagnet must be held over the iron filings kept inside the Petri dish

  2. Electromagnet lab

    After making the desired number of turns, the wire should be attached to another insulated wire using crocodile clips. 7. While wrapping the insulating wire, care should be taken that there is no space left between any of the turns.

  1. To find out what happens to the efficiency of a motor as I change ...

    They have resistance. Electric current is the movement of electrons through a conductor. Metals (e.g. wires) conduct electricity because the atoms do not hold on to their electrons well... FREE ELECTRONS are present. The number of mobile electrons that are in a length of wire will produce a certain amount of resistance.

  2. Investigation to see how the heat energy produced by ethanol compares with the heat ...

    total energy released in bond making is greater than the energy needed for bond breaking. This is shown in the energy level diagram below. The overall energy change in a reaction depends on the bond energies in the reactants and the product, which will release energy as heat.

  1. The elasticity of copper investigation

    Load of masses: at least 1kg of mass to test the wire * Copper wire: I will be testing the stretching and so finally the young's modulus on it * Micrometer: to accurately measure the diameter of the wire to 0.001mm * Vernier caliper: to accurately measure the tiny extensions

  2. The reactivity series.

    Therefore the most reactive metal will need less energy to remove electrons. Key Factors/Variables Key factors or variables can be changed that would make a difference to the reactions or results taking place. These are: > Amount of copper sulphate solution-use more or less.

  1. Investigating The Heat Of Combustion Of Alcohols.

    of alcohol in each spirit burner will decrease as the experiment goes on since other groups will be using the spirit burner. This means that the length of the wick may vary. This may cause anomalies in our experiment but hopefully we can still obtain as accurate results as possible.

  2. I am trying to find out what factors influence the energy change when metals ...

    won't be 100% accurate therefore we have to make sure that it is constant. 2) Amount used of copper sulphate, if it is too much or more that the previous one, it is yet again won't be that accurate because the more copper sulphate there is, the less energy it will give off when metal is added on to it.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work