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WHy OXygen can react with metal?

by no idea
Tags: metal, oxygen, react
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no idea
#1
Oct29-04, 08:16 AM
P: 93
WHy OXygen can react with metal?As i know , oxygen(O2) is bonded by covalent bond and it should be neutral charge. So how can the metal react with oxygen?
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Miracles
#2
Oct29-04, 08:38 AM
P: 5
The difference of electronegativity between iron and oxygen is greater than the one between two oxygens. That means the attraction between iron and oxygen is higher. As a result, the covalent bond between the oxygen ions break and create an ionic bond with iron.
chem_tr
#3
Oct29-04, 09:37 AM
Sci Advisor
PF Gold
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P: 613
Hello Miracles, you are right. However, there is one more thing; metal and molecular oxygen react in solution, that is, a very thin aqueous film formed by humidity on iron dissolves some of iron with the aid of molecular oxygen dissolved in that film. Iron has a greater stability in 3+ state, so eventually a significant amount of iron is oxidized to Fe(OH)3.

The same thing does not operate well in copper; we call the effect as "passive film formation".


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