Electrolysis

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

  The main topic is electrolysis.
• What is electrolysis used for in this context?

  It is used to separate the elements in insoluble ionic compounds like lead bromide.
• What equipment is necessary for performing electrolysis?

  A beaker, electrodes, and a power supply are necessary.
• What is an electrolyte?

  An electrolyte is a liquid or solution that contains an ionic compound with free-moving ions.
• How would you prepare an electrolyte from a soluble ionic compound like copper sulfate?

  You would dissolve it in water to create an aqueous solution.
• How do you prepare an electrolyte from an insoluble ionic compound like lead bromide?

  You would melt it to create a molten liquid.
• What ions are present in molten lead bromide?

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

  Electrodes are solid conductors generally made of metal or carbon.
• What is the positive electrode called?

  The positive electrode is called the anode.
• What is the negative electrode called?

  The negative electrode is called the cathode.
• Why do we need to connect the electrodes with wire?

  To allow electrons to flow between them.
• What does the term electrolysis literally mean?

  It means splitting up with electricity.
• What happens to the bromide ions during electrolysis?

  The bromide ions are attracted to the positive anode and are discharged to form bromine gas.
• What is produced when bromide ions are discharged at the anode?

  Bromine gas is produced.
• What happens to the lead ions during electrolysis?

  The lead ions are attracted to the negative cathode and are discharged to form pure lead.
• What is the result of lead ions being discharged at the cathode?

  Pure lead is formed and falls to the bottom.
• What is happening to the bromide ions at the anode?

  The bromide ions are being oxidized to bromine and lose one electron each.
• What is happening to the lead ions at the cathode?

  The lead ions are combining with two electrons and being reduced to form pure lead.
• How do electrons move during the electrolysis process?

  Electrons move from the bromide ions to the positive anode and then to the negative cathode.
• What is the overall purpose of electrolysis in this context?

  To convert the ions in a compound back into their pure elemental forms.
• What are the steps involved in the electrolysis of molten lead bromide?

  1. Prepare molten lead bromide as the electrolyte.
  2. Connect electrodes (anode and cathode) to a power supply.
  3. Pass an electric current through the electrolyte.
  4. Bromide ions are oxidized at the anode to form bromine gas.
  5. Lead ions are reduced at the cathode to form pure lead.
• What will be covered in the next two videos following this one?

  • Electrolysis of metal oxides to extract pure metal.
  • Electrolysis of aqueous solutions.