Make up the reaction equations: a) Fe → Fe (OH) 3 → Fe2O3 → Fe; b) Fe → FeCl3 → Fe2O3 → Fe (NO3) 3.

In water in the presence of oxygen, iron is oxidized to form iron (III) hydroxide.

4 Fe + 3O2 + H2O = 4 Fe (OH) 3.

Fe (OH) 3 is an insoluble base; when heated, it decomposes to oxide and water.

2Fe (OH) 3 = Fe2O3 + 3H2O.

Iron can be reduced from its oxides by reducing agents: H2, C, CO2, Al.

The reduction of metals from their oxides with aluminum is called aluminothermy.

Fe2O3 + 2Al = Al2O3 + 2Fe.

B)

2Fe + 3Cl2 = 2FeCl3

Iron (III) chloride when heated is oxidized by atmospheric oxygen to iron (III) oxide and chlorine is formed.

4FeCl3 + 3O2 = 2Fe2O3 + 6Cl2.

Fe2O3 – amphoteric oxide, reacts with acid to form iron (III) nitrate salt and water.

Fe2O3 + 6HNO3 = 2Fe (NO3) 3 +3 H2O.