Question

1) Ca→CaO→Ca(OH)₂→CaCl₂→Ca₃(PO₄)₂ 2) Ba→Ba(OH)₂→Ba(NO₃)₂→BaSO₄ ↓ BaBr₂

Answer 1

1) 2Ca+O2=2CaO
CaO+H2O=Ca(OH)2
Ca(OH)2+2HCl=CaCl2+H2O
CaCl2+ 2Na3PO4=Ca3(PO4)2+6NaCl
2) Ba+H2O=Ba(OH)2
3Ba(OH)2+2Al(NO3)3=2Al(OH)3+3Ba(NO3)2
Ba(NO3)2+Na2SO4=2NaNO3+BaSO4
Ba+Br2=BaBr2

Answer 2

1) The chemical reaction you provided involves the transformation of calcium (Ca) into calcium phosphate (Ca₃(PO₄)₂) through a series of intermediate steps. Here is a breakdown of the reaction:

- Calcium (Ca) reacts with oxygen (O₂) to form calcium oxide (CaO) according to the equation: Ca + O₂ → CaO. - Calcium oxide (CaO) then reacts with water (H₂O) to produce calcium hydroxide (Ca(OH)₂) through a process called hydration: CaO + H₂O → Ca(OH)₂. - Calcium hydroxide (Ca(OH)₂) reacts with hydrochloric acid (HCl) to form calcium chloride (CaCl₂) and water (H₂O): Ca(OH)₂ + 2HCl → CaCl₂ + 2H₂O. - Finally, calcium chloride (CaCl₂) reacts with phosphoric acid (H₃PO₄) to yield calcium phosphate (Ca₃(PO₄)₂) and hydrochloric acid (HCl): 3CaCl₂ + 2H₃PO₄ → Ca₃(PO₄)₂ + 6HCl.

2) The second chemical reaction you provided involves the transformation of barium (Ba) into barium sulfate (BaSO₄) through a series of intermediate steps. Here is a breakdown of the reaction:

- Barium (Ba) reacts with water (H₂O) to form barium hydroxide (Ba(OH)₂): Ba + 2H₂O → Ba(OH)₂. - Barium hydroxide (Ba(OH)₂) reacts with nitric acid (HNO₃) to produce barium nitrate (Ba(NO₃)₂) and water (H₂O): Ba(OH)₂ + 2HNO₃ → Ba(NO₃)₂ + 2H₂O. - Barium nitrate (Ba(NO₃)₂) then reacts with sulfuric acid (H₂SO₄) to yield barium sulfate (BaSO₄) and nitric acid (HNO₃): Ba(NO₃)₂ + H₂SO₄ → BaSO₄ + 2HNO₃. - The formation of barium sulfate (BaSO₄) is indicated by the downward arrow (↓) in the equation.

Please note that the reactions provided are simplified representations and may not account for all possible side reactions or conditions.