Electrons in a Redox Reaction

In an oxidation-reduction reaction, the element whose oxidation # goes ____ is oxidized and it ________ electrons. The element whose oxidation # goes ____ is reduced and ________ electrons.

Determine the oxidation number of each element in Na₂S₂O₃.

Determine the oxidation number of each element in NH₄⁺.

Determine the oxidation number of Cr in Cr₂O₃.

Determine the oxidation number of N in NO₃⁻.

Select the oxidation and reduction in the following chemical equation: 2Al + 3Br₂ → 2AlBr₃.

Select the oxidizing agent and identify the element that was oxidized in the reaction: 4Al + 3O₂ → 2Al₂O₃.

Select the reducing agent in the reaction: Fe₂O₃ + 3CO → 2Fe + 3CO₂.

Identify the element that was oxidized in the reaction: Fe₂O₃ + 3CO → 2Fe + 3CO₂.

Select the reducing agent and the element that was reduced in the reaction: CH₄ + 2O₂ → CO₂ + 2H₂O.