Răspuns:
1. 4Na+O2→2Na2O
2. Zn+ S → ZnS
3. Cu+ S→ CuS
4. Mg+F2→MgF2
5. 2 Ag + O2 → 2 AgO
6.2Al + 3Br2 → 2AlBr3
7.2Hg + O2→2HgO
8. 3K + P → K3P
9.3H2+N2→2NH3
10. Zn + S→ ZnS
11. 2Al+3H2→2AlH3
12. 2Al + 3H2SO4 → Al2(SO4)3 + 3H2
13.Ca + 2 HCl → CaCl2 + H2
14. Ba+Cl2→BaCL2
15. Mg + S → MgS
16. S+O2→SO2
17.P4+5O2→2P2O5
18.P4 + 6H2 → 4PH3
19.Pb+O2→PbO2
20. Ca+Br2→CaBr2
Explicație:
