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Chemical and Physical Changes!
Like Johnny said, the iron pipe is reacting with oxygen. But WHY is it a chemical reaction? The iron is in the presence of oxygen, and creates a brand new substance. Rust! Iron molecules react with oxygen molecules to make a the compound iron oxide. A compound is a thing that is made of two or more different elements, or a mixture.
Do you see that pipe over there? Do you see the rust? Yeah, that's chemical change right there. Why? The material of the pipe is reacting with oxygen.
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