(Si or Cr2O3) -- 3Si + 2Cr2O3 --> 4Cr + 3SiO2 Si oxidizes because Si(0) jumps to Si(+2) in SiO2
(N2 or H2) -- N2 + 3H2 --> 2NH3 H2 gets reduced because H2(0) jumps down to H(-1) in ammonia
CuCl2 or Zn) --CuCl2 + Zn --> ZnCl2 + Cu CuCl2 gets reduced because Cu(2+) jumps down to Cu(0) in Cu
2Al + Cr2O3 = Al2O3 + 2Cr
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