Iron oxide (rust)
Fe2O3
![When iron is exposed to water iron oxide or (rust) is produced](/images/user/base/Chemistry/7. Chemical Formulae/iron-oxide2-new.8b7eb16.jpg)
*This picture relies on the peg method of memory (the shoes representing 2 and the tree indicating the number 3.)
![](/images/user/base/Maths/Logarithms/Reference%20Tables/reference-log-table-1.4df6ee6.jpg)
![](/images/user/base/Maths/Logarithms/Reference%20Tables/reference-log-table-2.d516bb3.jpg)
![](/images/user/base/Maths/Logarithms/Reference%20Tables/reference-anti-log-table-1.b0b0513.jpg)
![](/images/user/base/Maths/Logarithms/Reference%20Tables/reference-anti-log-table-2.f89189d.jpg)
Fe2O3
*This picture relies on the peg method of memory (the shoes representing 2 and the tree indicating the number 3.)