1.
1)H₂+Cl₂=2HCl
2)Fe+2HCl=FeCl₂+H₂
3)4HNO₃ + FeCl₂ =2HCl + Fe(NO₃)₃+NO₂+H₂O
4)Na₂O+2HCl=NaCl₂+H₂O
2.
CaO+CO2=CaCO3
CaO+2HCl=CaCl₂+H₂O
Ca²⁺+O²⁻+2H⁺+2Cl-=Ca²⁺+2Cl⁻+H₂O
2H⁺+O²⁻=2H₂O
3.
Ba(NO₃)₂,KOH,CuCl₂,H₂SO₄,Al
1)Ba(NO₃)₂+H₂SO₄=BaSO₄+2HNO₃
2)CuCl₂+2KOH=Cu(OH)₂ осадок+2KCl
3)2KOH+H₂SO4=K₂SO₄+2H₂O
3)2Al+2KOH+6H₂O=2K[Al(OH)₄]+3H₂
4)3CuCl₂+A2l=2AlCl₃+3Cu