1) Ba + 2H2O = Ba (OH) 2 + H2 (when barium interacts with water, barium hydroxide and hydrogen are formed);
2) Ba (OH) 2 + 2HNO3 = Ba (NO3) 2 + 2H2O (when barium hydroxide interacts with nitric acid, barium nitrate and water are formed);
3) Ba (NO3) 2 + Ag2CO3 = BaCO3 + 2AgNO3 (when barium nitrate interacts with silver carbonate, barium carbonate and silver nitrate are formed);
4) BaCO3 + 2HCl = BaCl2 + CO2 + H2O (when barium carbonate interacts with hydrochloric acid, barium chloride, carbon dioxide and water are formed).
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