Oxygen combines with iron in the presence of water to form rust.
Which substance combines with iron in the presence of water to form rust? (1 point)
nitrogen
oxygen
carbon dioxide
acid
3 answers
are you sure
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.
7 answers