Question

1) Fe -> FeSO4 -> Fe2(SO4)3 -> Fe(OH)3 -> Fe(NO3)3; 2) Fe3O4 -> Fe -> FeCl2 -> FeCl3; 3) FeSO4 -> Fe(OH)2 -> Fe(OH)3 -> Fe2O3 -> Fe.

Answer 1

1. 1) Fe + H2SO4 =  FeSO4 +H2(улетучивается)
    2)  FeSO4 + 2H2SO4 + 2Cl2 = Fe(SO4)3 + 4HCl
    3) Fe2(SO4)3 + 6NaOH = 2Fe(OH)3 + 3Na2SO4
    4) Fe(OH)3 + 3HNO3 = Fe(NO3)3 + 3H2O

2. 1) Fe3O4 + 4CO = 3Fe + 4CO2
    2) Fe + 2HCl  = FeCl2 + H2
    3)  2FeCl2 + Cl2 = 2FeCl3

3. 1)  FeSO4 + 2NaOH = Fe(OH)2 + Na2SO4
    2) 4Fe(OH)2+O2+2H2O= 4Fe(OH)3
    3) 2Fe(OH)3 = Fe2O3 + 3H2O (при нагревании)
    4) Fe2O3 + 3H2 = 2Fe + 3H2O (1050−1100°C)

Answer 2

The sequences you provided depict the transformations of iron (Fe) through various chemical reactions. Here's a breakdown of each sequence:

1. Fe -> FeSO4 -> Fe2(SO4)3 -> Fe(OH)3 -> Fe(NO3)3:

   • Iron (Fe) reacts with sulfuric acid (H2SO4) to form iron(II) sulfate (FeSO4).
   • Iron(II) sulfate undergoes further reaction with sulfuric acid to yield iron(III) sulfate (Fe2(SO4)3).
   • Iron(III) sulfate reacts with hydroxide ions (OH-) to produce iron(III) hydroxide (Fe(OH)3).
   • Lastly, iron(III) hydroxide reacts with nitric acid (HNO3) to form iron(III) nitrate (Fe(NO3)3).

2. Fe3O4 -> Fe -> FeCl2 -> FeCl3:

   • Iron(II,III) oxide (Fe3O4), also known as magnetite, is reduced with carbon or another reducing agent to produce elemental iron (Fe).
   • The obtained iron (Fe) reacts with hydrochloric acid (HCl) to form iron(II) chloride (FeCl2).
   • Iron(II) chloride then undergoes oxidation with either chlorine gas (Cl2) or by reaction with oxygen to yield iron(III) chloride (FeCl3).

3. FeSO4 -> Fe(OH)2 -> Fe(OH)3 -> Fe2O3 -> Fe:

   • Iron(II) sulfate (FeSO4) reacts with a base such as sodium hydroxide (NaOH) to form iron(II) hydroxide (Fe(OH)2).
   • Iron(II) hydroxide is further oxidized by either air or an oxidizing agent to produce iron(III) hydroxide (Fe(OH)3).
   • The iron(III) hydroxide then undergoes dehydration to yield iron(III) oxide (Fe2O3).
   • Lastly, iron(III) oxide can be reduced to elemental iron (Fe) using a suitable reducing agent.

These sequences represent different chemical reactions and transformations of iron compounds, showcasing the versatility of iron and its ability to participate in various chemical processes.