Identify each situation below as oxidation or reduction.
Remember:
Free elements (including diatomic elements) have an oxidation number of 0.
If the oxidation number decreases, the substance has gained electrons.
If the oxidation number increases, the substance has lost electrons.
Column A
1.
Ca becoming Ca+2
:
Ca becoming Ca+2
2.
Cl2 becoming Cl-1
:
Cl2 becoming Cl-1
3.
N2 becoming N-3
:
N2 becoming N-3
4.
Na becoming Na+1
:
Na becoming Na+1
Column B
a.Reduction
b.Oxidation
1. b. Oxidation
2. a. Reduction
3. b. Oxidation
4. b. Oxidation