Сцепочками kclo3–? ——so2–s —h2–nh3–? —no2 o2–o3–? —naj—nacl kmno4–? —so2–? —h2s2o7–h2so4 –fe—fecl3–? —fe(oh)2–fe(oh)2–fe2(so4)3

Решение

KClO3–?—H2O—?—H2S—SO2–S

4KCl = t 400 C = 3 KCO4 + KCl

2KClO3 = t 100 C, MnO2= 2KCl + 3O2

O2 + 2H2 = 2H2O

6H2O + Al2S3 = 2Al(OH)3 + 3H2S

2H2S +  2O2 = SO2 + 2H2O

SO2 = S + O2

NaCl—?—NaH—H2–NH3–?—NO2

2NaCl + 2H2O = 2NaOH + Cl2 + H2↑

2Na + H2 = 2NaH

NaH + H2O = NaOH + H2↑

3H2 + N2 = 2NH3

4NH3 + 5O2 = катализ, t = 4NO + 6H2O

2NO + O2 = 2NO2

KMnO4–?—SO2–?—H2S2O7–H2SO4

O2 + S = SO2

2SO2 + O2 = 2SO3

SO3 + H2SO4 = H2S2O7

H2S2O7 + H2O = 2H2SO4

Fe—?—Fe2O3–Fe—FeCl3–?—Fe(OH)2–Fe(OH)3–Fe2(SO4)3

2Fe + 3Cl2 = 2FeCl3

FeCl3 + 3NaOH = Fe(OH)3↓ + 3NaCl

2Fe(OH)3↓ = t= Fe2O3 + 3H2O

Fe2O3 +3H2 = t 1000 C= Fe + 3H2O

2Fe + 3Cl2 = 2FeCl3

2FeCl3 + 3Zn = 3ZnCl2 + 2Fe

2Fe + 2H2O + O2 = 2Fe(OH)2

4Fe(OH)2 + 2H2O + O2 = 4Fe(OH)3↓

2Fe(OH)3 + 3H2SO4 = Fe2(SO4)3 + 6H2O