Identification of Oxidation and Reduction in Reactions
(i) Oxidation and Reduction in the Reaction
Answer: In this reaction, sodium (Na) is oxidized as it gains oxygen, and oxygen (O2) is reduced by gaining electrons.
Chemical Reaction:
2 Na (s) + O2 (g) → 2 Na2O (s)
(ii) Oxidation and Reduction in the Reaction
Answer: In this reaction, copper oxide (CuO) is reduced to copper (Cu), while hydrogen (H2) gets oxidized to form water (H2O).
Chemical Reaction:
CuO (s) + H2 (g) → Cu (s) + H2O (l)