Помогите решить цепочку превращений по химии!!!!!
1) Fe - FeCl2 - Fe(OH)3 - Fe2O3 - Fe - FeSO4 - Fe(OH)2
2)N2 - NH3 - NO2 - HNO3 - Cu(NO3)2 - Cu(OH)2 - CuO
3) Si - SiO2 - Na2SiO3 - H2SiO3 - SiO3 - Si - MG2Si - SiH4 - SiO2

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