Complete the reaction equation a) Li + O2 = b) Ag + HCl = c) Fe + CuSO4 = Specify the oxidation states of substances.

Complete the reaction equation a) Li + O2 = b) Ag + HCl = c) Fe + CuSO4 = Specify the oxidation states of substances. What is an oxidizing agent and a reducing agent in these reactions?

1) The reaction takes place between substances such as lithium and oxygen. As a result of the reaction, a substance is formed, lithium oxide. The molecular equation of the reaction can be written as follows:

4 Li + O2 = 2 Li2O

in this reaction, lithium is a reducing agent and, accordingly, is oxidized, and oxygen is an oxidizing agent and therefore is reduced.

2) The reaction between substances such as silver and hydrochloric acid is not possible, since hydrochloric acid is too weak to react with silver.

Ag + HCl = no reaction.

3) The reaction takes place between substances such as iron and copper sulfate salt. As a result of the reaction, substances are formed: pure copper and ferrous sulfate salt. The molecular equation of the reaction can be written as follows:

Fe + CuSO4 = Cu + FeSO4;

Iron is oxidized and therefore a reducing agent, copper is reduced and therefore an oxidizing agent.