2Mg+O2=2MgO
4Al+3O2=2Al2O3
2Zn+O2=2ZnO
4Na+O2=2Na2O
Mg+S=MgS
2Al+3S=Al2S3
Zn+S=ZnS
2Na+S=Na2S
Mg+2HCl=MgCl2+H2
2Al+6HCl=2AlCl3+3H2
Zn+2HCl=ZnCl2+H2
2Na+2HCl=2NaCl+H2
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Answers & Comments
2Mg+O2=2MgO
4Al+3O2=2Al2O3
2Zn+O2=2ZnO
4Na+O2=2Na2O
Mg+S=MgS
2Al+3S=Al2S3
Zn+S=ZnS
2Na+S=Na2S
Mg+2HCl=MgCl2+H2
2Al+6HCl=2AlCl3+3H2
Zn+2HCl=ZnCl2+H2
2Na+2HCl=2NaCl+H2