Compare the usefulness of carbon and copper electrodes in electrolysis experiments. Perform an electrolysis experiment with each set of electrodes, and see that using copper can cause a copper deposit to build up at one of the electrodes, while carbon never participates in the reaction.

This item teaches:

• about the electrodes used in the purification of copper by electrolysis
• about the extraction of copper using carbon
• about the extraction of copper by electrolysis
• about the purification of copper by electrolysis