Rust

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How does rust form under and on the side of cars and explain the chemical reaction that takes place to make it form?

In: Chemistry

Rust forms when Iron reacts with Oxygen and water.
Water Turns into OH- Ions (it gains electrons) and Iron turns into Fe2+ Ions (it loses electrons). Ions are charged particles. These ions now combine (they attract each other) and form Fe(OH)2.
This conpound now reacts further with oxygen and water to a mixture of different Iron-oxides, which is rust. It is not one single chemical compound.