Question

Identify the substances that are oxidised and the substance are reduced in the following reactions: 4na(s)+o2(g) 2na o2(s). Cuo+h2(g) cu(s)+h2o(l)

Answer 1

oxidation: the reaction in which oxygen is added and hydrogen is removed.

Reductin: the reaction in which hydrogen is added and oxygen is removed.

(i) Substances oxidised:
Na(s), H2(g)

(ii) Substances reduced:
O2(g), CuO(s).

Answer 2

Explanation:

oxidation: the reaction in which oxygen is added and hydrogen is removed.

Reductin: the reaction in which hydrogen is added and oxygen is removed.

(i) Substances oxidised:

Na(s), H2(g)

(ii) Substances reduced:

O2(g), CuO(s).