4K+O2=>2K2O
2K+2H2O =>2KOH+H2
2K+2HCl=>2KCl+H2
K+AgNO3=>KNO3+Ag
2K+Cl2=>2KCl
2Mg+O2=>2MgO
Mg+2H2O =>Mg(OH)2+H2
Mg+2HCl=>MgCl2 +H2
Mg+2AgNO3 =>Mg(NO3)2+2Ag
Mg+Cl2 =>MgCl2
4Al+3O2=>2Al2O3
2Al+6HCl=>2AlCl3 +3H2
Al+3AgNO3 =>Al(NO3)3+3Ag
2Al+3Cl2 =>2AlCl3
2Cu+O2=>2CuO
Cu+2H2O =>Cu(OH)2+H2
Cu+2HCl=>CuCl2+H2
Cu+2AgNO3 =>Cu(NO3 )2+2Ag
Cu+Cl2 =>CuCl2
