1/
a/ 4Na + O2 ===> 2Na2O
b/ 2Al + 6HCl ===> 2AlCl3 + 3H2
c/ 2Fe(OH)3 =(nhiệt)==> Fe2O3 + 3H2O
d/ 2AgNO3 + BaCl2 ===> Ba(NO3)2 + 2AgCl
2/
a/ Mg + 2HCl ===> MgCl2 + H2
b/ 2Ca + O2 ===> 2CaO
c/ C2H4 + 3O2 ===> 2CO2 + 2H2O
d/ 2Al(OH)3 + 3H2SO4 ===> Al2(SO4)3 + 6H2O