2Cu+O2 = 2CuO CuO+2HCl = CuCl2+H2O CuCl2+ 2NaOH = Cu(OH)2 +2NaCl
Cu(OH)2 = CuO + H2O CuO + 2HNO3 = Cu(NO3)2 + H2O
S + O2 ⇒SO2 + O2 ⇒SO3 +H2O = H2SO4 +Mg + MgSO4 + H2
H2+ Cl2 = 2HCl HCl + NaOH = NaCl + H2O
2NaCl ⇒electroliza⇒ 2Na + Cl2 2Na + H2O = 2NaOH
2NaOH + CO2 = Na2CO3 + H2O