Redox Equation and Half equation
2Mg+ O2 → 2MgO
0 0 +2 -2
The diagram above shows that Mg to Mg 2+ is oxidation (reducing agent)
O2 to O2– reduction occurs (oxidizing agent)
Half equation
Some reactions maybe written in 2 halves (the oxidation half and the reduction half). The 2 parts are called the half equations.
2Mg+ O2 → 2MgO
Oxidation reduction
2Mg -4e- → 2Mg2+ O2 +4e- → 2O2–
Electrons are lost electrons are gained
Redox Reaction
Zn + CuSO4 → ZnSO4 +Cu
0 +2 +2 0
Half equations
Oxidation: Zn -2e- → Zn 2+ reducing agent
Reduction: Cu 2+ +2e- → Cu oxidizing agent
Try:
Zn + H2SO4 → ZnSO4 +H2