5.2.1 Cells & Batteries

• Cells contain chemicals which react to produce…?

  Electricity.
• How can a simple cell be made?

  Connecting two different metals in contact with an electrolyte.
• What factors into the voltage of a cell?

  • Type of electrodes
  • Type of electrolyte
• How do the types of electrodes affect the voltage of a cell?

  The bigger the difference in reactivity of the electrodes, the bigger the voltage of the cell.
• Why does the electrolyte used in a cell affect its voltage?

  Different ions in solution will react differently with the metal electrodes used.
• What is a battery?

  Two or more cells connected together in series.
• Why do batteries have larger voltages than cells?

  The voltages of the cells in the battery are combined so there is a greater voltage overall.
• When do the chemical reactions stop in non-rechargeable cells and batteries?

  When one of the reactants has been used up.
• What is an example of a non-rechargeable battery?

  Alkaline batteries.
• Why can rechargeable batteries and cells be recharged?

  The chemical reactions are reversed when an electrical current is supplied.