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

1 Answer
Jun 23, 2018

Answer:

Well #"elemental iron"# is OXIDIZED to #"ferric oxide..."#

Explanation:

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....