REDOX

• What is an oxidising agent?

  A substance that accepts electrons from another substance.

  • it itself gets reduced
• What is a reducing agent?

  Substance that donates electrons and causes another substance to be reduced.

  • it itself is oxidised
• What is the first step to Robbos rules?

  Balance everything other than oxygen and hydrogen
• What is the second step to Robbos rules?

  Balance oxygen with water
• What is the third step to Robbos rules?

  Balance hydrogen with H+
• What is the special step in Robbos rules?

  If in alkaline conditions add OH- to both sides

  • if H+ is present, it will react and form water
• What is the fifth step in Robbos rules?

  Add electrons to balance charges
• What is the last step in Robbos rules?

  Multiply half equations and combine

  • cancel out electrons and any other atoms
• How do you balance using oxidation numbers?

  1.) write unbalanced equation

  2.) assign oxidation numbers and deduce oxidation state changes

  3.) balance oxidation state changes

  4.) balance charges

  5.) balance remaining atoms
• when balancing with oxidation numbers the oxidation stages need to balance and be equal for both species that change oxidation state