1. O2+4 Cu--->2 Cu2O
2. O2+N2--->2 NO
3. 3 O2+4 Fe--->2 Fe2O3
4. O2+S--->SO2
5. 5 O2+4 As--->2 As2O5
6. 3 O2+2 Cr--->2 CrO3
7. 7 O2+4 Mn--->2 Mn2O7
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Verified answer
1. O2+4 Cu--->2 Cu2O
2. O2+N2--->2 NO
3. 3 O2+4 Fe--->2 Fe2O3
4. O2+S--->SO2
5. 5 O2+4 As--->2 As2O5
6. 3 O2+2 Cr--->2 CrO3
7. 7 O2+4 Mn--->2 Mn2O7