(NH4)2SO4+Ba(OH)2___BaSO4+2NH4OH
NaOH+SO2___NaHSO3
CaO+H2O___Ca(OH)2
CuCL2+Zn__ZnCL2+Cu
FeCl3+3AgNO3___Fe(NO3)3+3AgCl
2Al+3CuO___AL2O3+3Cu
N2O5+H2O___2HNO3
2H2+2S___2H2S
2Be+O2___2BeO
SnO2+2H2O___Sn(OH)4
(NH4)2SO4+Ba(OH)2___BaSO4+2NH4OH
NaOH+SO2___NaHSO3
CaO+H2O___Ca(OH)2
CuCL2+Zn__ZnCL2+Cu
FeCl3+3AgNO3___Fe(NO3)3+3AgCl
2Al+3CuO___AL2O3+3Cu
N2O5+H2O___2HNO3
2H2+2S___2H2S
2Be+O2___2BeO
SnO2+2H2O___Sn(OH)4