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Chemical, as rust is iron oxide. The iron is turning from iron to iron oxide, which (as you can see) is a chemical change. In general, a colour change usually indicates a chemical change.
Both milk souring and iron rusting are chemical changes.
Iron rusting is a chemical change: oxidation of the metal by oxygen in the air or water. When iron 'rusts' it oxidises. This is a chemical change, a physical change is when a molecule changes state, for example iron melting and going from a solid to a liquid.
It is a chemical change, the iron is being oxidized and forming rust. A good way to think about it is if you can undo it then it is a physical change. For example if you put salt in water, that is a physical change because you can boil off the water and get the salt back. Source: AP Chemistry
Physical change
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Iron rusting is a chemical change.
Chemical change, oxygen binds with iron.
Because it is not a physical change it is a chemical change.
Yes, it is, because the chemical composition of the outside changes due to oxydation.
Rusting is a chemical change, as steel/iron turns into iron oxide.
Rusting is a chemical process, an oxidation reaction.
The process is called oxidation. And it's not a physical reaction it's a chemical one.
Chemical. Rust is iron oxide. Oxygen bonds chemically to the iron.
Chemical reaction from water
Chemical, as rust is iron oxide. The iron is turning from iron to iron oxide, which (as you can see) is a chemical change. In general, a colour change usually indicates a chemical change.