1) S + O2 = SO2 (when sulfur reacts with oxygen, sulfur (IV) oxide is formed);
2) 2SO2 + O2 = 2SO3 (when sulfur (IV) oxide interacts with oxygen, sulfur (VI) oxide is formed);
3) SO3 + H2O = H2SO4 (when sulfur (VI) oxide interacts with water, sulfuric acid is formed);
4) H2SO4 + BaCl2 = BaSO4 + 2HCl (when sulfuric acid reacts with barium chloride, barium sulfate and hydrochloric acid are formed).
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