electrolysis

• What process uses electricity to extract elements from a compound?

  Electrolysis
• What is the name for the positive electrode in electrolysis?

  Anode
• What is the name of the negative electrode in electrolysis?

  Cathode
• What is the definition of an electrolyte?

  Liquid that contains ions and conducts electricity
• Where are metals formed during electrolysis?

  Cathode
• Where are non-metals formed during electrolysis?

  Anode
• How can ionic substances be electrolysed?

  By melting or dissolving and passing current
• Why can't solid ionic substances be electrolysed?

  Ions cannot move or conduct electricity
• In solution electrolysis, when is a metal not produced at the cathode?

  When the metal is more reactive than hydrogen
• In metal halide solution electrolysis, what forms at the anode?

  Halogen
• In metal sulfate solution electrolysis, what forms at the anode?

  Oxygen
• What is the half equation for the ionisation of water?

  H₂O(l) → H⁺(aq) + OH⁻(aq)
• What metals are extracted from ionic compounds using electrolysis?

  Metals more reactive than carbon
• In aluminium oxide electrolysis, why is cryolite mixed in?

  To lower the melting point
• In aluminium oxide electrolysis, what are the anodes made of?

  Graphite
• In aluminium oxide electrolysis, why do the anodes need replacement?

  They react with oxygen being formed