1. http://lawrencekok.blogspot.com Prepared by Lawrence Kok Video Tutorial on Redox Half Equation, Oxidation, Reduction, Oxidizing and Reducing Agent.

2. Redox reaction - TWO HALF equation, oxidation/reduction Oxidizing Agent Reducing Agent Zn (RA) with Fe 3+ (OA) SO 2 (RA) with Fe 3+ (OA)

3. Redox reaction - TWO HALF equation, oxidation/reduction Oxidizing Agent Reducing Agent Zn (RA) with Fe 3+ (OA) SO 2 (RA) with Fe 3+ (OA) Half equations

4. Redox reaction - TWO HALF equation, oxidation/reduction KI (RA) with Fe 3+ (OA) SO 3 2- (RA) with Fe 3+ (OA) H 2 S (RA) with Fe 3+ (OA)

5. Redox reaction - TWO HALF equation, oxidation/reduction KI (RA) with Fe 3+ (OA) SO 3 2- (RA) with Fe 3+ (OA) H 2 S (RA) with Fe 3+ (OA) Half equations

6. Balancing redox reaction between MnO 4 - (OA) with SO 2 (RA) in acidic medium Reduction half equation Oxidation half equation

7. Balancing redox reaction between MnO 4 - (OA) with SO 2 (RA) in acidic medium Reduction half equation Oxidation half equation Redox Equation + +

8. Balancing redox reaction between Cr 2 O 7 2- (OA) with NO 2 - (RA) in acidic medium Reduction half equation Oxidation half equation

9. Balancing redox reaction between Cr 2 O 7 2- (OA) with NO 2 - (RA) in acidic medium Reduction half equation Oxidation half equation Redox Equation + +

10. Balancing redox reaction between MnO 4 - (OA) with Fe 2+ (RA) in acidic medium Reduction half equation Oxidation half equation

11. Balancing redox reaction between MnO 4 - (OA) with Fe 2+ (RA) in acidic medium Reduction half equation Oxidation half equation Redox Equation + +

12. Balancing redox reaction between CIO 3 - (OA) with I - (RA) in acidic medium Reduction half equation Oxidation half equation

13. Balancing redox reaction between CIO 3 - (OA) with I - (RA) in acidic medium Reduction half equation Oxidation half equation Redox Equation + +

14. Balancing redox reaction between Cr 2 O 7 2- (OA) with Fe 2+ (RA) in acidic medium Reduction half equation Oxidation half equation

15. Balancing redox reaction between Cr 2 O 7 2- (OA) with Fe 2+ (RA) in acidic medium Reduction half equation Oxidation half equation Redox Equation + +

16. Balancing redox reaction between HNO 3 (OA) with Fe 2+ (RA) in acidic medium Oxidation half equation Reduction half equation

17. Balancing redox reaction between HNO 3 (OA) with Fe 2+ (RA) in acidic medium Oxidation half equation Reduction half equation Redox Equation + +

18. Disproportional Reaction Redox reaction where same substance is both oxidised and reduced at the same time Substance acts as oxidizing and reducing agent Decomposition of Nitric (III) acid to Nitric (II) acid Decomposition of Copper (I) sulphate to Copper (II) sulphate and Copper Decomposition of Potassium chlorate (V) acid to Potassium chlorate (VII) and Potassium chloride 3HNO 2 → HNO 3 + 2NO + H 2 O Cu 2 (SO 4 ) → CuSO 4 + Cu KCIO 3 → KCIO 4 + KCI

19. Disproportional Reaction Redox reaction where same substance is both oxidised and reduced at the same time Substance acts as oxidizing and reducing agent Decomposition of Nitric (III) acid to Nitric (II) acid Decomposition of Copper (I) sulphate to Copper (II) sulphate and Copper Decomposition of Potassium chlorate (V) acid to Potassium chlorate (VII) and Potassium chloride 3HNO 2 → HNO 3 + 2NO + H 2 O Cu 2 (SO 4 ) → CuSO 4 + Cu KCIO 3 → KCIO 4 + KCI

20. Use Half equation to write Redox equation 1. Magnesium reducing Lead ions to Lead metal 2. Sulphur dioxide oxidised to sulphate by reducing iodine to iodide 3. Iron (II) oxidised to iron (III) by hydrogen peroxide 4. Zinc reducing dichromate ion to chromium (III)

21. Use Half equation to write Redox equation 1. Magnesium reducing Lead ions to Lead metal Redox equation 2. Sulphur dioxide oxidised to sulphate by reducing iodine to iodide Redox equation 3. Iron (II) oxidised to iron (III) by hydrogen peroxide Redox equation 4. Zinc reducing dichromate ion to chromium (III) Redox equation

22. Which is Oxidizing and Reducing Agent ? 1 1 2 2 3 3 (Cr 2 O 7 ) 2- + 8 H + + 3(NO 2 ) - + 3H 2 O → 2Cr 3+ + 7H 2 O + 3(NO 3 ) - 5As 2 O 3 + 2 MnO 4 - + 16H + → 2Mn 2+ + 5 As 2 O 5 + 8 H 2 O 5H 2 O 2 + 2MnO 4 - + 6H + → 2Mn 2+ + 5O 2 + 8H 2 O

23. Which is Oxidizing and Reducing Agent ? 1 1 2 2 3 3 (Cr 2 O 7 ) 2- + 8 H + + 3(NO 2 ) - + 3H 2 O → 2Cr 3+ + 7H 2 O + 3(NO 3 ) - 5As 2 O 3 + 2 MnO 4 - + 16H + → 2Mn 2+ + 5 As 2 O 5 + 8 H 2 O 5H 2 O 2 + 2MnO 4 - + 6H + → 2Mn 2+ + 5O 2 + 8H 2 O

24. Video on Redox half reactions Oxidizing agent using potassium chlorate IB Chemistry Redox half reactionBalancing Redox reaction Redox reaction on gallium beating heart Redox turning copper to silver to gold

25. Acknowledgements Thanks to source of pictures and video used in this presentation Thanks to Creative Commons for excellent contribution on licenses http://creativecommons.org/licenses/ Prepared by Lawrence Kok Check out more video tutorials from my site and hope you enjoy this tutorial http://lawrencekok.blogspot.com