K+S -> K2S (2K + S -> K2S)Zn+N2 -> Zn3N2 (3Zn + N2 -> Zn3N2)Ni2O+N2O5 -> Ni(NO3)2 (2NiO + 5N2O5 -> 2Ni(NO3)2)FeCl2+Cl2 -> FeCl3 (2FeCl2 + Cl2 -> 2FeCl3)CuO -> Cu2O + O2 (2CuO -> 4Cu2O + O2)
K+S -> K2S (2K + S -> K2S)
Zn+N2 -> Zn3N2 (3Zn + N2 -> Zn3N2)
Ni2O+N2O5 -> Ni(NO3)2 (2NiO + 5N2O5 -> 2Ni(NO3)2)
FeCl2+Cl2 -> FeCl3 (2FeCl2 + Cl2 -> 2FeCl3)
CuO -> Cu2O + O2 (2CuO -> 4Cu2O + O2)