give the name and formulas of the compounds that rust is composed of
Here is some reading for you. Rust is not that easily defined, at least not chemically.
http://en.wikipedia.org/wiki/Rust
Rust is primarily composed of iron oxide, which is a compound formed when iron reacts with oxygen and water. The most common form of rust is known as iron(III) oxide, with a chemical formula Fe2O3.
To derive this information, you can follow these steps:
1. Identify the elements present: In this case, rust is composed mainly of iron and oxygen.
2. Determine the oxidation states of the elements: Iron can have various oxidation states, but in rust, it is in the +3 oxidation state, denoted by "III." Oxygen usually has an oxidation state of -2.
3. Write the chemical formula: Iron combines with oxygen to form the compound, so the formula will include both elements. To balance the charges, two iron atoms will combine with three oxygen atoms, leading to the formula Fe2O3.
Therefore, the compound that rust is primarily composed of is iron(III) oxide, with a chemical formula Fe2O3.