Question

Rust forms when _____ reacts with chemicals in rocks.

Answer 1

Answer : Rust forms when oxygen reacts with chemicals in rocks.

Explanation :

Rusting : It is a chemical process in which an iron react with oxygen to give an iron(III)oxide as a product. The product iron(III)oxide formed from the chemical reaction is known as rust.

The chemical reaction will be,

`4Fe+3O_2\rightarrow 2Fe_2O_3`

Hence, rust forms when oxygen reacts with chemicals in rocks.

Answer 2

Rust forms when oxygen reacts with chemicals in rocks, and that is often the case with many other elements in general. Like a copper nail being exposed to the air will rust.