Dưới đây là phương trình hóa học của các phản ứng trong bảng:

1. \( \text{Na}_2\text{O} + \text{H}_2\text{O} \rightarrow 2 \text{NaOH} \)
2. \( \text{BaO} + \text{H}_2\text{O} \rightarrow \text{Ba(OH)}_2 \)
3. \( \text{Cl}_2 + \text{HCl} \rightarrow 2 \text{HCl} \) (Phản ứng không xảy ra)
4. \( \text{Al}_2\text{O}_3 + 6 \text{HCl} \rightarrow 2 \text{AlCl}_3 + 3 \text{H}_2\text{O} \)
5. \( \text{ZnO} + 2 \text{HNO}_3 \rightarrow \text{Zn(NO}_3)_2 + \text{H}_2\text{O} \)
6. \( \text{CaCO}_3 + 2 \text{NaOH} \rightarrow \text{Na}_2\text{CO}_3 + \text{Ca(OH)}_2 \)
7. \( \text{K}_3\text{PO}_4 + \text{MgSO}_4 \rightarrow \text{Mg}_3(\text{PO}_4)_2 + 3 \text{K}_2\text{SO}_4 \)
8. \( \text{Al}_2(\text{SO}_4)_3 + \text{Ba(NO}_3)_2 \rightarrow 3 \text{BaSO}_4 + 2 \text{Al(NO}_3)_3 \)
9. \( \text{Fe}_2(\text{SO}_4)_3 + 6 \text{HCl} \rightarrow 2 \text{FeCl}_3 + 3 \text{H}_2\text{SO}_4 \)
10. \( \text{CaCl}_2 + 2 \text{HCl} \rightarrow \text{CaCl}_2 + \text{H}_2\text{O} + \text{CO}_2 \) (Phản ứng không xảy ra)
11. \( \text{Na} + \text{H}_2\text{O} \rightarrow \text{NaOH} + \frac{1}{2} \text{H}_2 \)
12. \( \text{H}_2\text{S} + \text{O}_2 \rightarrow \text{S} + \text{H}_2\text{O} \)
13. \( \text{MnO}_2 + \text{HBr} \rightarrow \text{Br}_2 + \text{MnBr}_2 + \text{H}_2\text{O} \)
14. \( \text{Fe(OH)}_2 + \text{O}_2 \rightarrow \text{Fe(OH)}_3 \)
15. \( \text{Fe}_3\text{O}_4 + \text{CO} \rightarrow \text{Fe} + \text{CO}_2 \)
16. \( \text{Cu} + \text{HCl} \rightarrow \) (Phản ứng không xảy ra)
17. \( \text{H}_2\text{SO}_4 + \text{Cu} \rightarrow \text{CuSO}_4 + \text{SO}_2 + 2 \text{H}_2\text{O} \)
18. \( 3 \text{NO}_2 + \text{HCl} \rightarrow \text{KCl} + \text{MnCl}_2 + \text{Cl}_2 + 2 \text{H}_2\text{O} \)

Hãy nhớ rằng một số phản ứng có thể không xảy ra hoặc yếu.