Half equations and REDOX equations

• Half equation

  A balanced equation which only shows either the oxidation or reduction during a redox reaction
• Rules to calculate half equations

  1. Balance out elements if needed (not oxygen or hydrogen)

  2. balance oxygens with water

  3. Balance hydrogens with H+

  4. Balance charges with electrons
• Half equations can be combined to give ...

  An overall ionic equation for a redox reaction
• Combining half equations rules

  1. Write 2 half equations

  2. Combine by multiplying each equation so the electrons are the same (common multiple)

  3. Put all the reactants together and all the products together, and then cancel out anything that appears on both sides
• Roman numerals

  Roman numerals indicate the positive oxidation state of the elements that has a variable oxidation state
• Roman Numerals example

  Sodium chlorate(V) -NaClO3