Question

Which substance combines with iron in the presence of water to form rust? (1 point)
nitrogen
oxygen
carbon dioxide
acid
GPT-4o mini
Oxygen combines with iron in the presence of water to form rust.
are you sure
GPT-4o mini
Yes, I am sure. Rust, which is primarily composed of iron oxide (Fe₂O₃), forms when iron reacts with oxygen in the presence of water (or moisture). The chemical reaction can be summarized as follows:

\[
4Fe + 3O₂ + 6H₂O \rightarrow 4Fe(OH)₃
\]

This eventually dehydrates to form rust. So, the correct substance that combines with iron to form rust in the presence of water is oxygen.

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