Electrolysis- molten compounds

• What is the main topic of today's video?

  Electrolysis
• What does electrolysis allow us to do with ionic compounds?

  Separate the elements in insoluble ionic compounds
• What is an electrolyte?

  A liquid or solution containing ionic compounds
• Why must the ions in an electrolyte be free to move?

  To conduct electricity during electrolysis
• How would you prepare an electrolyte from copper sulfate?

  Dissolve it in water
• What must be done to lead bromide to use it as an electrolyte?

  It must be melted to become molten
• What ions are present in molten lead bromide?

  Positive lead ions and negative bromide ions
• What are the electrodes made of?

  Metal or carbon
• What is the positive electrode called?

  Anode
• What is the negative electrode called?

  Cathode
• Why do we need a power supply in electrolysis?

  To drive the flow of electrons
• What does the term electrolysis literally mean?

  Splitting up with electricity
• What happens to bromide ions at the anode?

  They are oxidized to form bromine gas
• What do the positive lead ions do at the cathode?

  They are reduced to form pure lead
• What is the overall process of electrolysis in this example?

  Electrons are transferred from bromide to lead ions
• What is produced when bromine atoms pair up during electrolysis?

  Bromine gas
• What will happen to the pure lead formed during electrolysis?

  It will fall to the bottom
• What is oxidized at the anode during electrolysis?

  Bromide ions
• What is reduced at the cathode during electrolysis?

  Lead ions
• How do electrons move during the electrolysis process?

  From bromide ions to lead ions
• What are the steps involved in the electrolysis of molten lead bromide?

  1. Prepare molten lead bromide as electrolyte.
  2. Connect electrodes: anode (positive) and cathode (negative).
  3. Apply electric current using a power supply.
  4. Bromide ions oxidized at anode to form bromine gas.
  5. Lead ions reduced at cathode to form pure lead.
• What will be covered in the next two videos?

  1. Electrolysis of metal oxides to extract pure metal.
  2. Electrolysis of aqueous solutions.