Al+3S -> Al2S3 + q
4Ag + O2 -> 2Ag2O + q
Ca + 2NaOH -> Ca(OH)2 + 2Na
2Al + 3H2SO4 -> Al2(SO4)3 + 3H2
Sn + MgSO4 -> SnSO4 + Mg
Zn + Pb(NO3)2 -> Zn(NO3)2 + Pb
Ba + 2H2O -> Ba(OH)2 + H2
Fe + PbS -> FeS + Pb
Al+3S -> Al2S3 + q
4Ag + O2 -> 2Ag2O + q
Ca + 2NaOH -> Ca(OH)2 + 2Na
2Al + 3H2SO4 -> Al2(SO4)3 + 3H2
Sn + MgSO4 -> SnSO4 + Mg
Zn + Pb(NO3)2 -> Zn(NO3)2 + Pb
Ba + 2H2O -> Ba(OH)2 + H2
Fe + PbS -> FeS + Pb