Al + H2O = Al(OH)3 + H2
K + O2 = 2K2O
Ca + S = CaS
Fe + H2O = Fe3O4 + H2
Mg + HNO3 = Mg(NO3)2 + H2
Zn + H2O = ZnO + H2
Zn + AgNO3 = Zn(NO3)2 + Ag
Al + H2O = Al(OH)3 + H2
K + O2 = 2K2O
Ca + S = CaS
Fe + H2O = Fe3O4 + H2
Mg + HNO3 = Mg(NO3)2 + H2
Zn + H2O = ZnO + H2
Zn + AgNO3 = Zn(NO3)2 + Ag