3.7 REDOX

• Br- (Bromide ion)


  Colourless
• Br2 (Bromine)


  Orange/Brown
• Cl- (Chloride ion)


  Colourless
• Cl2 (Chlorine)


  Pale Green
• Cr3+ (Chromium III ion)


  Green
• Cu (Copper metal)


  Pink/Brown
• Cu2+ (Copper II ion)


  Blue
• Cr2O7 2- (Dichromate ion)


  Orange
• H2 (Hydrogen gas)


  Colourless
• H+ (Hydrogen ion)


  Colourless
• H2O2 (Hydrogen peroxide)


  Colourless
• H2O (Water)


  Colourless
• O2 (Oxygen gas)


  Colourless
• I- (Iodide ion)


  Colourless
• I2 (Iodine)


  Brown
• Fe (Iron metal)


  Silver
• Fe2+ (Iron II ion)


  Pale Green
• Fe3+ (Iron III ions)


  Pale Orange
• Mg (Magnesium)


  Silver
• Mg2+ (Magnesium ion)


  Colourless
• Mn2+ (Manganese ion)


  Colourless
• MnO4- (Permanganate ion)


  Purple
• SO2 (Sulfur dioxide)


  Colourless
• SO4 2- (Sulfate ion)


  Colourless
• Zn (Zinc)


  Silver
• Zn2+ (Zinc ion)


  Colourless
• Oxidation


  The process where an atom loses electrons
• Reduction


  The process where an atom gains electrons
• Oxidation number


  The charge an atom would have in a compound if it was ionic
• Reactivity series

  Order of metals from most to least reactive; more reactive metals will displace less reactive metals in solution
• Reduction-Oxidation reactions


  A reaction involving the transfer of electrons