Dau, Coroana!!
Chimie
![Dau CoroanaChimie class=](https://ro-static.z-dn.net/files/d60/89269cdfb27560f07f7eb9426b600bc1.jpg)
Răspuns:
S + Fe → FeS
2Ca + O₂ → 2CaO
2H₂O → 2H₂↑ + O₂↑
MgCO₃ → MgO + CO₂↑
-Mihai