1. H₂ + Cl₂ = 2HCl

2. 3MgO + 2H₃PO₄ = Mg₃(PO₄)₂ + 3H₂O

3. 3CaCl₂ + 2K₃PO₄ = Ca₃(PO₄)₂↓ + 6KCl

4. 2Zn + O₂ = 2ZnO

5. 3Ca + N₂ = Ca₃N₂

6. Ca + 2HCl = CaCl₂ + H₂↑

7. Mg + CuCl₂ = MgCl₂ + Cu↓

8. 3Zn + 2FeCl₃ = 3ZnCl₂ + 2Fe↓

9. Ca(OH)₂ + 2HNO₃ = Ca(NO₃)₂ + 2H₂O

10. 2Al + 3S = Al₂S₃

11. 2KBr + F₂ = 2KF + Br₂↑

12. 6NaOH + Fe₂(SO₄)₃ = 3Na₂SO₄ + 2Fe(OH)₃↓