scrieti ecuatiile reactiilor ce corespund schemei
![Scrieti Ecuatiile Reactiilor Ce Corespund Schemei class=](https://ro-static.z-dn.net/files/d39/e0837565c5c929c5ca39434ddbc41ffc.jpg)
4Na + O2 =2 Na2O
S + O2 =SO2
2Mg + O2 =2MgO
2H2 + O2 =2H2O
4Al + 3O2=2 Al2O3
3Fe + 2O2 = Fe3 O4