oxidation and reduction

• Reduction and oxidation reactions are often called redox reactions. They always occur together. Oxidation and reduction take place in reactions where electron transfer takes place
• Oxidation

  • loss of electrons
  • gain of oxygen
• Reduction

  • gain of electrons
  • loss of oxygen
• Redox reaction – a reaction in which atoms have their oxidation state changed.
• Oxidation states

  • Hydrogen = +1
  • group 1 metals = +1
  • group 2 metals = +2
  • oxygen = -2
  • Fluorine = -1
  • Chlorine = -1
• • An increase in oxidation state shows oxidation
  • A decrease in oxidation state shows reduction