Chemical Changes

• What happens when a Metal reacts with Oxygen?


  A Metal Oxide is formed
• Explain the Reactivity Series

  • Potassium, Sodium and Lithium react rapidly with water at room temperature
  • Calcium reacts quite rapidly with water at room temperature
  • Magnesium, Zinc, Iron and Copper have no reaction
• A more reactive element will displace a less reactive element from its compound
• What is electrolysis?

  • Solid ionic Compounds cannot conduct electricity
  • The ions are locked in place and are not free to move
  • When an ionic compound is melted or dissolved in water, the forces of attraction are broken and the ions are free to move
  • These liquids and solutions can now conduct electricity - These are called electrolytes
• What is a Cathode?

  Negative electrode
• What is an Anode?

  Positive electrode
• Positive Ions move to the cathode to and gain electrons to form atoms
• Negative Ions move to the anode and lose electrons to form atoms
• Aqueous - Dissolves in Water
• Hydrogen Is produced at the cathode if the metal is more reactive than hydrogen