3.2 - Oxidation and Reduction Equations

• Importance of balanced equations

  identify reactants and products with their formula

  indicate relative numbers of atoms and Molecules in the reaction

  Calculate amounts of substances
• Oxoanions


  ion with general formula XaOyz-

  examples: sulfate, nitrate & phosphate ions
• colours of iron ions

  Fe2+ is green

  Fe3+ is brown
• colours of copper

  Cu is reddish brown

  CuO is black

  CuSO4 is blue

  CuCO3 is green
• chage of ammonium

  +1
• charge of zinc


  +2
• charge of aluminium


  3+
• nitrite ion


  (NO2)-
• nitrate ion


  (NO3) -
• sulfide ion


  (S) 2-
• sulfite ion


  (SO3)2-
• sulfate ion


  (SO4) 2-
• carbonate ion


  (CO3)2-
• nitride ion


  (N) 3-
• phosphate ion


  (PO4)3-
• half-equations


  equations that describe Oxidation or reduction in a redox reaction
• redox reaction


  reaction where oxidation and reduction happen at the same time
• displacement reaction


  redox reaction

  more reactive metal/halogen displaces less reactive metal/halogen