Question 5(d)(iii)
[Maximum number: 2]
This question is about displacement reactions.
A student uses this method to investigate what happens when excess metal is added to a solution of copper(II) sulfate.
- pour some copper(II) sulfate solution into a polystyrene cup and record the temperature
- add excess metal W to the polystyrene cup and stir the mixture
- record the maximum temperature reached
- calculate the temperature increase of the solution
The student repeats the method for metals X, Y and Z.
For each metal, the student records three sets of results.
The table shows the student's results.
Explain the order of reactivity for metals W, X, Y and Z.