Reaction equation: Ba – BaO – Ba (OH) 2 – Ba (NO3) 2 – BaSO4 – BaCL2

Let’s carry out the transformation: Ba -> BaO -> Ba (OH) 2 -> Ba (NO3) 2 -> BaSO4 -> BaCL2
1) 2Ba + O2 = 2BaO – this reaction refers to the reactions of the compound
2) BaO + H2O = Ba (OH) 2 – this reaction refers to the reactions of the compound
3) Ba (OH) 2 + 2HNO3 = Ba (NO3) 2 + 2H2O – this reaction refers to exchange reactions. It flows to the end, as water has formed.
4) Ba (NO3) 2 + H2SO4 = BaSO4 + 2HNO3 – this reaction belongs to exchange reactions, it proceeds to the end, since a precipitate (BaSO4) has formed.
5) BaSO4 + CaCl2 = Bal2 + CaSO4 – BaSO4 – this reaction refers to exchange reactions.