Worksheet for practicing balancing chemical equations, featuring 25 problems with incomplete equations requiring coefficient input.

1. 2 H₂ + 1 O₂ → 2 H₂O
2. 1 N₂ + 3 H₂ → 2 NH₃
3. 1 S₈ + 12 O₂ → 8 SO₃
4. 2 N₂ + 1 O₂ → 2 N₂O
5. 2 NO → 1 N₂ + 1 O₂
6. 2 C₆H₆ + 15 O₂ → 12 CO₂ + 6 H₂O
7. 1 Zn + 2 HCl → 1 ZnCl₂ + 1 H₂
8. 1 SiCl₄ + 4 H₂O → 1 Si(OH)₄ + 4 HCl
9. 2 NaHCO₃ → 1 Na₂CO₃ + 1 H₂O + 1 CO₂
10. 1 H₃PO₄ + 3 NaOH → 1 Na₃PO₄ + 3 H₂O
11. 1 C₅H₁₂ + 8 O₂ → 5 CO₂ + 6 H₂O
12. 1 CO₂ + 2 NH₃ → 1 OC(NH₂)₂ + 1 H₂O
13. 4 Al + 17 Cl₂ → 8 AlCl₃ + 5 Cl₂
14. 2 Al(OH)₃ + 3 H₂SO₄ → 1 Al₂(SO₄)₃ + 6 H₂O
15. 4 Fe + 3 O₂ → 2 Fe₂O₃
16. 1 Fe₂O₃ + 3 CO → 2 Fe + 3 CO₂
17. 2 C₇H₆O₂ + 15 O₂ → 14 CO₂ + 6 H₂O
18. 1 H₂SO₄ + 8 HI → 1 H₂S + 4 I₂ + 4 H₂O
19. 2 FeBr₃ + 3 H₂SO₄ → 1 Fe₂(SO₄)₃ + 6 HBr
20. 1 Al + 3 HCl → 1 AlCl₃ + 3/2 H₂
21. 1 FeCl₃ + 3 HI → 1 FeI₃ + 3 HCl
22. 1 Na₂CO₃ + 2 HCl → 2 NaCl + 1 H₂O + 1 CO₂
23. 2 K + 1 Br₂ → 2 KBr
24. 1 CH₄ + 11 O₂ → 7 CO₂ + 8 H₂O
25. 1 P₄ + 5 O₂ → 2 P₂O₅