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7.4. Exercices<br />
Recopie chacune <strong>de</strong>s équations ci-<strong>de</strong>ssous en les pondérant<br />
1. FeS + HCl => H2S +FeCl2<br />
2. KNO3 => KNO2 +O2<br />
3. Pb(NO3)2 => PbO +NO2 + O2<br />
4. Na + H2O => NaOH +H2<br />
5. Fe + H2O =>Fe3O4 + H2<br />
6. Fe3O4 +H2 => Fe + H2O<br />
7. CO2 + NaOH =>NaHCO3<br />
8. NaCl + H2SO4 =>HCl + NaHSO4<br />
9. CaCO3 => CaO + CO2<br />
10. ZnS + O2 => ZnO +SO2<br />
11. Na2O2 +H2O => NaOH + O2<br />
12. Al + H2SO4 =>Al2(SO4)3 +H2<br />
13. C3H8 +O2 => CO2 + H2O<br />
14. NH3 +H3PO4 =>(NH4)3PO4<br />
15. S + O2 =>SO2<br />
16. SO2 + O2 =>SO3<br />
17. FeS + HCl => FeCl2 +H2S<br />
18. PCl5 + H2O => H3PO4 + HCl<br />
19. Ca(OH)2 + H3PO4 => Ca3(PO4)2 + H2O<br />
20. H2S + O2 => H2O + SO2<br />
21. NH3 + O2 => NO + H2O<br />
22. Fe + FeCl3 => FeCl2<br />
23. NH3 + O2 => NO + H2O<br />
24. H2O2 => H2O + O2<br />
25. Al + HCl => AlCl3 + H2<br />
49<br />
G-M <strong>Jacques</strong>