1.Sn+2H2O= SnO2+H22.SnO2+2Ca=2CaO+Sn3.Sn+2HCl=SnCl2+H2 4.SnCl2+2NaOH=Sn(OH)2 + 2NaCl5.Sn(OH)2=SnO + H2O реакция разложения