t Mg(OH)= Na+S= Ba+O2= K+Br2= Na+O2= C+H2= b+O2= Na+H2= H2+02=
2K+Br2= 2KBr Mg(OH)2 = MgO + H2O 2Na+S=Na2S 2Ba+O2=2BaO 2K + Br2 = 2KBr 4Na+O2= 2Na2O C+2H2= CH4 4B+3O2= 2B2O3 2Na+H2= 2NaH 2H2+02=2H2O