Investigation of the effect of the mass of Zinc, on the temperature change of a Copper Sulphate solution

Note: I couldn't paste in pictures and diagrams so please excuse any large spaces.
Planing my investigation
Method
1.Firstly I will measure 20ml of Copper Sulphate solution (CuSO4) in a measuring cylinder, for precise accuracy, and then pour the solution into test tube. I will place the test tube into a beaker and insulate the test tube, for minimum heat loss. (As shown in the diagram above.)
2.Secondly I will measure the required amount of Zinc (Zn) on a weighing scale, again for precise accuracy. I will then measure the starting temperature using a thermo…