Question

Explain why electrolysis is an expensive way of extracting metals from their ores.

Answer 1

Electrolysis is an expensive process due to the high amount of energy is requires.

In order for the extraction of metals from their ores, the metals must be in a molten form throughout the process. Metals typically have high melting points, this means they require extremely high temperatures in order to melt.
High temperatures require high energy and so high expenses.
These high temperatures must be maintained throughout the electrolysis process making the process rather expensive.