Make the equations: Zn (OH) 2 – ZnO – ZnCl2 K – KOH – K2SO4 Ba – Ba (OH) 2 – BaCO3

1 chain:

1) Zn (OH) 2 = ZnO + H2O (when heated, zinc hydroxide decomposes into zinc oxide and water);

2) ZnO + 2HCl = ZnCl2 + H2O (when zinc oxide interacts with hydrochloric acid, zinc chloride and water are formed).

2 chain:

1) 2K + 2H2O = 2KOH + H2 (when potassium interacts with water, potassium hydroxide and hydrogen are formed);

2) 2KOH + H2SO4 = K2SO4 + 2H2O (when potassium hydroxide interacts with sulfuric acid, potassium sulfate and water are formed).

3 chain:

1) Ba + 2H2O = Ba (OH) 2 + H2 (when barium interacts with water, barium hydroxide and hydrogen are formed);

2) Ba (OH) 2 + CO2 = BaCO3 + H2O (when barium hydroxide interacts with carbon dioxide, barium carbonate and water are formed).