1) SO₂ + H₂O = H₂SO₃
2) C + O₂ = CO₂
CO₂ + CaO = CaCO₃
3) 2Na + O₂ = Na₂O₂
Na₂O₂ + 2Na = 2Na₂O
Na₂O + H₂O = 2NaOH
4) 4Al + 3O₂ = 2Al₂O₃
Al₂O₃ + 6HCl = 2AlCl₃ + 3H₂O
AlCl₃ + 3NaOH = Al(OH)₃ + 3NaCl
5) N₂O₅ + H₂O = 2HNO₃
10HNO₃(конц) + 4Ca = 4Ca(NO₃)₂ + N₂O + 5H₂O
6) Si + O₂ = SiO₂
SiO₂ + 2NaOH = Na₂SiO₃ + H₂O
Na₂SiO₃ + 2HCl = H₂SiO₃ + 2NaCl
H₂SiO₃ (t)= SiO₂ + H₂O