K+O2= K+F2= K+CaO= K+H2SO4= K+Na= K+KOH= K+S= K+Li2SO4= K+CO2= K+ZnCi2= K+H2O= K+Cu(NO3)2= K+Al2O3=
2K + F2 = 2KF 2K + 3H2SO4 = 2KHSO4 + SO2↑ + 2H2O 2KOH + 2K = 2K2O + H2 2K + S = K2S 2K + 2H2O = 2KOH + H2↑ K + Cu(NO3)2