EVERYDAY SCIENCE

Detailed explanation-1: -The rusting of iron is a chemical change because it is two substances reacting together to make a new substance. When iron rusts, iron molecules react with oxygen molecules to make a compound called iron oxide. Rusting would only be a physical change if iron molecules remained pure iron throughout the process.

Detailed explanation-2: -Rust is a result of chemical reaction where iron gets oxidized in presence of oxygen and moisture to form iron oxide. The chemical reaction for rusting is: 4Fe + 3O2 → 2Fe2O3.

Detailed explanation-3: -Rust is an iron oxide, a product of the reaction between iron and oxygen in the presence of water or air moisture. The oxygen reacts with the iron to form iron oxide, which is also known as rust. The water helps the oxygen to react with the iron by providing a source of moisture.

Detailed explanation-4: -The formation of rust is a chemical change because rust is a different kind of matter than the iron, oxygen, and water present before the rust formed.

Detailed explanation-5: -Iron rusting is an oxidation reaction. During rusting, iron combines with oxygen in the air in the presence of water to generate Fe2O3. xH2O, a hydrated iron (III) oxide.