1. 2Cu + O2 => 2CuO
2. 2W + 3O2 => 2WO3
3. 4Li + O2 => 2Li2O
4. Se + O2 => SeO2
5. 4V + 5O2 => 2V2O5
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Answers & Comments
1. 2Cu + O2 => 2CuO
2. 2W + 3O2 => 2WO3
3. 4Li + O2 => 2Li2O
4. Se + O2 => SeO2
5. 4V + 5O2 => 2V2O5