Adding zinc (Zn) dust into the copper sulphate (CuSO4 ) solution.

 When you add zinc (Zn) dust to a copper sulfate (CuSO4) solution, a chemical reaction will occur between the zinc and copper sulfate. This reaction is a classic example of a displacement or single replacement reaction. In this reaction, zinc will displace copper from copper sulfate, resulting in the formation of zinc sulfate and the liberation of copper metal. 

The balanced chemical equation for this reaction is as follows:

Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s)

Now, let's discuss the temperature changes that may occur during this reaction:

1. **Exothermic Reaction (Heat Release):** This reaction is exothermic, which means it releases heat energy. As the zinc displaces copper from copper sulfate, chemical bonds are broken and formed. Breaking bonds requires energy, and when new bonds are formed, energy is released. In this case, more energy is released when the new bonds in zinc sulfate are formed compared to the energy required to break the bonds in copper sulfate and zinc. This results in a net release of energy in the form of heat.

2. **Temperature Increase:** Due to the exothermic nature of the reaction, the temperature of the solution will increase. The solution will become warmer as heat is generated. The extent of the temperature increase will depend on factors such as the amount of zinc added and the concentration of the copper sulfate solution.

3. **Observation:** You may notice a rise in temperature in the reaction vessel, and the reaction mixture may become warm to the touch. If the temperature change is significant, you might even observe steam or vapor rising from the solution due to the heat generated.

It's important to note that the temperature increase resulting from this reaction will depend on various factors, including the concentrations and amounts of reactants, the specific heat capacities of the substances involved, and the efficiency of heat transfer between the reaction mixture and its surroundings. The reaction is also typically quite rapid, especially if the zinc is in powdered form, so the temperature increase can be noticeable relatively quickly.