Rust is a mixture of A. FeO and Fe(OH)3 B. FeO and Fe3O4 C. Fe2O3 and Fe(OH)3 D. Fe(OH)3 and Fe3O4
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Which elements will make up rust (FeO)? A. aluminum and oxygen B. copper and oxygen C. iron and oxygen D. zinc and oxygen
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Iron corrodes to produce rust, $\mathrm{Fe}_{2} \mathrm{O}_{3},$ but other corrosion products that can form are $\mathrm{Fe}(\mathrm{O})(\mathrm{OH}),$ iron oxyhydroxide, and magnetite, $\mathrm{Fe}_{3} \mathrm{O}_{4}$ . (a) What is the oxidation number of Fe in iron oxyhydroxide, assuming oxygen's oxidation number is $-2 ?$ (b) The oxidation number for Fe in magnetite was controversial for a long time. If we assume that oxygen's oxidation number is $-2,$ and Fe has a unique oxidation number, what is the oxidation number for Fe in magnetite? (c) It turns out that there are two different kinds of Fe in magnetite that have different oxidation numbers. Suggest what these oxidation numbers are and what their relative stoichiometry must be, assuming oxygen's oxidation number is - 2 .
When steam is passed over red hot iron, the substances formed are: (a) $\mathrm{Fe}_{2} \mathrm{O}_{3}+\mathrm{H}_{2}$ (b) $\mathrm{Fe}_{3} \mathrm{O}_{4}+\mathrm{H}_{2}$ (c) $\mathrm{FeO}+\mathrm{H}_{2}$ (d) $\mathrm{FeO}+\mathrm{H}_{2}+\mathrm{O}_{2}$
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