Chapter 6, Activity 8. “Oxidation-Reduction Reactions”. LEO SAYS GER. Activity 8 The Meaning of Oxidation and Reduction (called “ redox ”). OBJECTIVES Define oxidation and reduction in terms of the loss or gain of oxygen, and the loss or gain of electrons.
LEO SAYS GER
Each sodium atom loses one electron:
Each chlorine atom gains one electron:
Lose Electrons = Oxidation
Sodium is oxidized
Gain Electrons = Reduction
Chlorine is reduced
- Losing electrons is oxidation, and the substance that loses the electrons is called the reducing agent.
- Gaining electrons is reduction, and the substance that gains the electrons is called the oxidizing agent.
Mg(s) + S(s) → MgS(s)
Mg is oxidized: loses e-, becomes a Mg2+ ion
Mg is the reducing agent
S is the oxidizing agent
S is reduced: gains e- = S2- ion
- Reactions in which there has been no change in oxidation number are NOT redox reactions.