A chemical change is when the change of their chemical properties, for an example the formation of rust on iron.
Rusting is a chemical change because two substance reacting together is making a new substance.
So when it rains oxygen and water are mixing together if something metal is left out then it turns into rust.
For example this nail was left out here while it rained and it turned into rust.
This is why the change of color and into rust is a chemical change.
So if you don't want your stuff to be rusted don't leave it outside.
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