Electrolysis

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

  The main topic is electrolysis.
• What does electrolysis allow us to do with insoluble ionic compounds?

  It allows us to separate the elements in insoluble ionic compounds.
• What is an electrolyte?

  An electrolyte is a liquid or solution that contains an ionic compound.
• Why must the ions in the electrolyte be free to move?

  They must be free to move to conduct electricity during electrolysis.
• 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.
• What must you do to prepare an electrolyte from an insoluble ionic compound like lead bromide?

  You must 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 used in electrolysis generally made of?

  They are 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.
• What is required to allow electrons to flow between the electrodes?

  Some kind of wire is needed to connect the electrodes.
• What is the role of the power supply in electrolysis?

  The power supply drives the flow of electrons between the electrodes.
• What does the term electrolysis literally mean?

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

  They are attracted to the positive anode and are discharged to form bromine gas.
• What occurs when bromide ions are discharged at the anode?

  They go from charged ions to neutral atoms and form bromine gas.
• What happens to the positive lead ions during electrolysis?

  They are attracted to the negative cathode and are discharged to form pure lead.
• What is produced at the cathode during the electrolysis of molten lead bromide?

  Pure lead is produced at the cathode.
• What is the overall process of electrolysis in terms of electron transfer?

  Electrons are transferred from negative bromide ions to positive lead ions.
• What happens to the bromide ions at the anode in terms of oxidation?

  The bromide ions are oxidized to bromine and lose one electron each.
• What happens to the lead ions at the cathode in terms of reduction?

  The lead ions combine with two electrons and are reduced to form pure lead.
• What is the overall reaction in electrolysis of molten lead bromide?

  • Bromide ions are oxidized to bromine gas at the anode.
  • Lead ions are reduced to pure lead at the cathode.
  • Electrons flow from bromide ions to lead ions.
• 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).
  3. Apply power supply to drive electron flow.
  4. Bromide ions are oxidized at the anode.
  5. Lead ions are reduced at the cathode.
  6. Collect bromine gas and pure lead.
• What will be covered in the next two videos?

  The electrolysis of metal oxides and the electrolysis of aqueous solutions.