Which substance combines with iron in the presence of water to form rust

Answer 1

Rust forms when iron combines with oxygen in the presence of water. The chemical process is known as oxidation. Specifically, the formation of rust typically involves the reaction of iron (Fe) with oxygen (O2) and water (H2O), leading to the creation of iron oxide (Fe2O3·nH2O), commonly known as rust. The presence of water acts as an electrolyte, facilitating the electrochemical reactions that lead to the corrosion of iron.