jamesharbor13
jamesharbor13 jamesharbor13
  • 21-05-2017
  • Chemistry
contestada

In a redox reaction, why does an element's oxidation number increase

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kristoffer
kristoffer kristoffer
  • 21-05-2017
If the element is oxidized, then it's oxidation number would increase.

Let's say we have the following reaction.
2H2O --> O2 + 2H2

To the left, the oxidation number of O is -2, as it is bonded to two H, which is always H+. To the right, we have O2, and all gases have a oxidation number of 0 (zero). We say that O has been oxidized. 
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