Metal Extraction

The video tutorial explains electrolysis, a process using electricity to separate elements from compounds. It demonstrates the electrolysis of copper chloride, showing how copper and chlorine gas are isolated. The tutorial also covers the industrial electrolysis of aluminium from bauxite, highlighting the energy-intensive nature of the process and the benefits of recycling aluminium to save energy.

What is the primary purpose of electrolysis in the context of metal extraction?

• To combine metals with other elements

• To separate metals from their ores

• To create new metal alloys

• To increase the weight of metals

Which of the following is NOT required for the electrolysis experiment described?

• AC power supply

• Carbon electrodes

• Blue litmus paper

• Copper chloride solution

During the electrolysis of copper chloride, what is observed at the negative electrode?

• Bubbles of gas forming

• The solution turning blue

• Copper being deposited

• The electrode dissolving

What happens to the blue litmus paper when it is exposed to the gas produced at the positive electrode?

• It turns white

• It remains blue

• It dissolves

• It turns red

What ions are attracted to the positive electrode during the electrolysis of copper chloride?

• Oxygen ions

• Hydrogen ions

• Chloride ions

• Copper ions

How much energy is approximately required to extract one kilogram of aluminium using electrolysis?

• 10 kilowatt hours

• 20 kilowatt hours

• 5 kilowatt hours

• 15 kilowatt hours

Why is recycling aluminium considered beneficial in terms of energy consumption?

• It produces more aluminium

• It is faster than extraction

• It requires more energy than extraction

• It requires less energy than extraction