№1
2 Al+3 Cl2 = 2 AlCl3
4 K+O2↑ = 2 K2O
CrO3+3 H2↑ = Cr+3 H2O
№2
2 Ca+O2↑ = 2 CaO
2 H2↑+O2↑ = 2 H2O
2 Al+3 S = Al2S3
№1
2 Al+3 Cl2 = 2 AlCl3
4 K+O2↑ = 2 K2O
CrO3+3 H2↑ = Cr+3 H2O
№2
2 Ca+O2↑ = 2 CaO
2 H2↑+O2↑ = 2 H2O
2 Al+3 S = Al2S3