1) 2Al + 2S=Al2S3
2Al+3 O2=2Al2O3
2Al+3Cl2= 2AlCl3
2)2Br+7O2= 2Br2O7
Br2+H2=2HBr
2Br+Ca= CaBr2
3) 3H2+N2=2NH3
H2+Cl2=2HCl
H2+2Na=2NaH
4) 4B+3O2=2B2O3
Ba+S=BaS
2Be+O2=2BeO
1) 2Al + 2S=Al2S3
2Al+3 O2=2Al2O3
2Al+3Cl2= 2AlCl3
2)2Br+7O2= 2Br2O7
Br2+H2=2HBr
2Br+Ca= CaBr2
3) 3H2+N2=2NH3
H2+Cl2=2HCl
H2+2Na=2NaH
4) 4B+3O2=2B2O3
Ba+S=BaS
2Be+O2=2BeO