napisz 3 reakcje powstawania i
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napisz 3 reakcje powstawania i
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Cr₂O₃
1)4Cr+3O₂ -> 2Cr₂O₃
2)2CrO+2O₂ -> 2Cr₂O₃
3)2CrO₃+3Mg -> Cr₂O₃+3MgO
Al₂O₃
1)Fe₂O₃+2Al -> Al₂O₃+2Fe
2)4Al + 3O2 -> 2Al2O3
3)3Fe3O4+8Al -> 4Al2O3+9Fe