Question

Ca->Ca(OH)2->CaCl2->Ca(NO3)2->CaSO4

Answer 1

1. Ca + 2H₂O = Ca(OH)₂ + H₂
2. Ca(OH)₂ + 2HCl = CaCl₂ + 2H₂O
3. CaCl₂ + 2AgNO₃ = Ca(NO₃)₂ + 2AgCl
4. Ca(NO₃)₂ + H₂SO₄ = CaSO₄ + 2HNO₃