Complete the definition of electrolysis by inserting the missing words. The decomposition of [BLANK] compounds when molten or [BLANK] by the passage of an electric current.
State whether the mass of the cathode increases, decreases or stays the same when platinum electrodes are used.
Describe the change in appearance, if any, of the electrolyte when platinum electrodes are used.
Describe what is seen at the anode when platinum electrodes are used.
Write the ionic half-equation for the reaction at the anode.
State whether the mass of the cathode increases, decreases or stays the same when copper electrodes are used.
Describe the change in appearance, if any, of the electrolyte when copper electrodes are used.
Name this ore of aluminium.
Name the substance added to this process to reduce the operating temperature.
Explain why the anodes need to be continually replaced during this process.