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.
Chapter 6, Activity 8
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.