How can the following transformations be carried out: a) barium – barium oxide – barium hydroxide

How can the following transformations be carried out: a) barium – barium oxide – barium hydroxide – barium phosphate b) silicon – silicon oxide – barium silicate c) beryllium oxide – beryllium chloride – beryllium hydroxide? Write down the equations for the corresponding reactions.

A) Ba – BaO – Ba (OH) 2 – Ba3 (PO4) 2
1) 2 Ba + O2 = 2 BaO (barium oxide, compound),
2) BaO + H2O = Ba (OH) 2 (barium hydroxide, compound),
3) 3 Ba (OH) 2 + 2 H3PO4 = Ba3 (PO4) 2 + 6 H2O (barium phosphate and water; exchange).

B) Si – SiO2 – BaSiO3
Si + O2 = SiO2 (silicon oxide, compound),
SiO2 + Ba (OH) 2 = BaSiO3 + H2O (barium silicate and water; exchange).

B) BeO – BeCl2 – Be (OH) 2
BeO + 2 HCl = BeCl2 + H2O (beryllium chloride and water; exchange),
BeCl2 + 2 NaOH = Be (OH) 2 + 2 NaCl (beryllium hydroxide and sodium chloride, exchange).