In the chemical reaction $4Fe+3O_2 -> 2Fe_2O_3$, which elements are oxidized?

Md Ariful Islam

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Md Ariful Islam

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And we could represent this by half-equations....CLEARLY iron metal is oxidized....

$FerarrFe^(3+) + 3e^(-)$ $(i)$

And meanwhile, the potent OXIDANT, dioxygen gas is reduced to $O^(2-)$...

$O_2(g) + 4e^(-) rarr 2O^(2-)$ $(ii)$

WE add $4xx(i)+3xx(ii)$ to get....

$4Fe(s)+3O_2(g) + 12e^(-)rarrunderbrace(4Fe^(3+)+6O^(2-))_(2Fe_2O_3) + 12e^(-)$

And finally....

$4Fe(s)+3O_2(g) + rarr 2Fe_2O_3(s)$

Rust prevention is a very big deal....teams of corrosion engineers assess the degree of rust in bridges and office-blocks, and attempt to control the oxidation....

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