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The nuts, bolts, and hinges that attach some gates to a playground fence can be made of iron. The iron can react with oxygen in the air. The unbalanced equation representing this reaction is shown below.
___Fe(s) + ___O2(g) → ___Fe2O3(s)
62 Balance the equation in your answer booklet for the reaction, using the smallest whole-number coefficients. [1]
63 Determine the change in oxidation state for oxygen in this reaction. [1]
The balanced equation is 4Fe(s) + 3O2(g) -> 2Fe2O3(s). For the oxygen, its oxidation state in O2 is 0 and in Fe2O3 is -2. So the oxidation state change from 0 to -2.
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