RoseMarie Gallagher and Paul Ingram Solutions for Chapter: Electricity and Chemical Change, Exercise 6: Q

Copper$\left(\mathrm{II}\right)$ ions are blue. When copper$\left(\mathrm{II}\right)$ sulphate solution is electrolysed, the blue solution loses its colour when carbon electrodes are used. Explain the observation.  

Copper$\left(\mathrm{II}\right)$ ions are blue. When copper$\left(\mathrm{II}\right)$ sulphate solution is electrolysed, the blue solution keeps its colour when copper electrodes are used. Explain the observation.  

If you want to purify a metal by electrolysis, will you make it the anode or the cathode? Why? 

Describe the process of refining copper. 

What does electroplating mean? 

Steel cutlery is often electroplated with nickel. Why?