1. What is it and where do we see it?
Redox
What is it and where do we see it?

2. In the Environment

3. Corrosion

4. In Your Body

5. Fermentation

6. On Wounds

7. On Your Head

8. On Clothes

9. Reducing ores (smelting)

10. Fe + S → FeS
Synthesis reactions

11. Fe + S → FeS Determining agents
Electronegativity difference determines what is oxidized and what is reduced
Reducing agents cause the reduction of another species
Determining agents

12. Fe + S → FeS Determining agents
Electronegativity difference determines what is oxidized and what is reduced
Oxidizing agents cause the oxidation of another species
Determining agents

13. Fe + S → FeS Determining agents
S is more electronegative and therefore oxidizes Fe
S is the oxidizing agent
S itself is reduced
Determining agents

14. Fe + S → FeS Determining agents
S is more electronegative and therefore oxidizes Fe
S is the oxidizing agent
S itself is reduced
Determining agents

15. Fe + S → FeS Determining agents
S is more electronegative and therefore oxidizes Fe
S is the oxidizing agent
S itself is reduced
Determining agents

16. Fe + S → FeS Determining agents
S is more electronegative and therefore oxidizes Fe
S is the oxidizing agent
S itself is reduced
Determining agents

17. Higher electronegativity? Oxidizing agent? What is reduced?
Now You Try
2Na + Cl NaCl
Higher electronegativity?
Oxidizing agent?
What is reduced?
Determining agents

18. Determining agents Now You Try 2Na + Cl2 2 NaCl
Higher electronegativity? Cl2
Oxidizing agent? Cl2
What is reduced? Cl2
Determining agents

19. Lower electronegativity? Reducing agent? What is reduced?
Now You Try
4K + O K2O
Lower electronegativity?
Reducing agent?
What is reduced?
Determining agents

20. Lower electronegativity? K Reducing agent? K What is reduced? O2
Now You Try
4K + O K2O
Lower electronegativity? K
Reducing agent? K
What is reduced? O2
Determining agents

21. Oxidation is the gain of oxygen
4K + O2 2 K2O
K has gained an O and has been oxidized.
Oxygen is the oxidizing agent.
Oxygen has been reduced.
Other Definitions

22. What is the oxidizing agent? What has been reduced?
Now You Try
2 S2O32−(aq) + I2(aq) → S4O62−(aq) + 2 I−(aq)
What has been oxidized?
What is the oxidizing agent?
What has been reduced?
Other Definitions

23. S2O32− has gained oxygen. It has been oxidized.
Now You Try
2 S2O32−(aq) + I2(aq) → S4O62−(aq) + 2 I−(aq)
S2O32− has gained oxygen. It has been oxidized.
Iodine is the oxidizing agent.
Iodine itself has been reduced.
Other Definitions

24. Oxidation may be the loss of hydrogen.
CH3OH -> CH2O + H2
What has been oxidized?
What is the oxidizing agent?
Other Definitions

25. Oxidation may be the loss of hydrogen.
CH3OH -> CH2O + H2
What has been oxidized? Methanol
Other Definitions

26. OIL RIG LEO the lion says GER Oxidation may be the loss of electrons.
Other Definitions