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↓