Question

осуществить превращения по схеме: Ba-->BaO-->Ba(OH)2--> BaSO4

Answer 1

1. Ba + O₂ = 2BaO 
2. BaO + H₂O = Ba(OH)₂ 
3. Ba(OH)₂ + H₂SO₄ = BaSO₄ + 2H₂O

Answer 2

Ba + O₂ = 2BaO 
BaO + H₂O = Ba(OH)₂ 
Ba(OH)₂ + H₂SO₄ = BaSO₄ + 2H₂O