4.3.3 Using electrolysis to extract metals

• Electrolysis uses electricity to drive a chemical reaction
• Oxygen or chlorine gas is produced at the anode
• The anode is the positive electrode where oxidation occurs.
• Electrolysis is used to extract or refine metals and non-metals.


  True
• Electrolysis results in the production of less reactive gases
• Electrolysis is the process of using electricity to drive a chemical
• The electrolyte in electrolysis is a molten salt or aqueous solution
• Metal deposition at the cathode is an example of oxidation.

  False
• Name a metal typically extracted using electrolysis.

  Aluminium
• What is used as the electrolyte in the extraction of aluminium using electrolysis?

  Molten cryolite
• What is the purpose of the power source in electrolysis?

  Provides voltage
• The anode is the positive electrode where oxidation takes place.

  True
• The anode is the positive electrode where oxidation occurs.

  True
• Define electrolysis.

  Chemical reaction driven by electricity
• What are the main components of an electrolytic cell?

  Cathode, anode, electrolyte, power source
• What type of solution is used as an electrolyte in electrolysis?

  Molten salt or aqueous solution
• At the anode, oxidation leads to the production of substances like oxygen or chlorine gas.


  True
• Match the metal with its electrolysis process:

  Aluminium ↔️ Extracted from molten cryolite

  Copper ↔️ Extracted from copper sulfate solution
• Order the steps in the electrolysis process:

  1️⃣ Electric current is passed through a molten salt or aqueous solution

  2️⃣ Chemical changes occur at the electrodes

  3️⃣ Products are formed at the cathode and anode
• Less reactive elements are oxidized at the anode during electrolysis


  True
• The electrolyte in electrolysis is a molten salt or aqueous solution.
• Reduction occurs at the cathode in electrolysis.


  True
• The cathode is the positive electrode where reduction occurs.

  False
• Steps involved in the process of electrolysis

  1️⃣ Set up the electrolytic cell with the electrolyte and electrodes.

  2️⃣ Connect the cell to a power source.

  3️⃣ Ions migrate towards the electrodes based on their charge.

  4️⃣ Reduction occurs at the cathode, and oxidation occurs at the anode.
• At the anode, less reactive elements undergo oxidation
• Electrolysis produces metals with very high purity
• Electrolysis produces metals with purity levels often exceeding 99%
• The cathode is the negative electrode where reduction occurs
• What type of changes occur at the electrodes during electrolysis?

  Chemical changes
• What is the role of the electrolyte in electrolysis?

  Conducts electric current
• Electrolysis involves passing an electric current through a molten salt or aqueous solution.


  True
• The cathode is the negative electrode where reduction occurs and more reactive elements are deposited.
• The power source in an electrolytic cell provides the necessary voltage to drive the process.
• At the cathode, reduction results in the deposition of more reactive metals.
• Copper is extracted from copper sulfate solution using electrolysis.
• What is electrolysis?

  A process using electricity
• More reactive elements are oxidized at the anode

  False
• The cathode is the negative electrode where reduction occurs.
• Order the events at the cathode and anode during electrolysis:

  1️⃣ Cathode: More reactive elements undergo reduction

  2️⃣ Anode: Less reactive elements undergo oxidation
• At the anode, oxidation occurs, releasing gases like oxygen or chlorine.