electrolysis of molten compounds

• What can ionic compounds conduct when molten or dissolved in water?

  Electricity
• Why can ionic compounds conduct electricity when molten or dissolved?

  Because ions are free to move
• What are the reactions taking place at the electrodes during electrolysis?

  Reduction at the cathode, oxidation at the anode
• What is the definition of electrolysis?

  Process of using electricity to drive a chemical reaction
• What happens to lead when lead bromide forms?

  Lead loses two electrons to form lead ions
• What ions are formed when lead bromide is created?

  Lead ions $Pb^{2+}$ and bromide ions $Br^{-}$
• Why can't solid ionic compounds conduct electricity?

  Because ions are locked in place
• What happens to the forces of attraction in ionic compounds when melted or dissolved?

  They are broken, allowing ions to move
• What are electrolytes?

  Liquids or solutions that conduct electricity
• What is the negative electrode called in electrolysis?

  Cathode
• What is the positive electrode called in electrolysis?

  Anode
• What happens to positive lead ions at the cathode during electrolysis?

  They gain electrons to form lead atoms
• What happens to negative bromide ions at the anode during electrolysis?

  They lose electrons to form bromine atoms
• What do bromine atoms do after forming during electrolysis?

  They pair to form bromine molecules
• What are the key facts about electrolysis of ionic compounds?

  • Solid ionic compounds cannot conduct electricity
  • Ions are locked in place in solids
  • Molten or dissolved ionic compounds can conduct electricity
  • Electrolysis involves reduction and oxidation reactions
• What are the steps involved in electrolysis of lead bromide?

  1. Lead bromide is melted or dissolved.
  2. Positive lead ions move to the cathode.
  3. Lead ions gain electrons and are reduced.
  4. Negative bromide ions move to the anode.
  5. Bromide ions lose electrons and are oxidized.
  6. Bromine atoms pair to form bromine molecules.