If you forget to dry off a bread knife after washing it, and reddish-brown spots appear on it, would that be a physical or chemical change?
Answer (3)
It is an example of chemical change.
the answer is chemical change everybody knows that
The appearance of reddish-brown spots on a bread knife after washing and not drying is a result of a chemical change known as rusting. Rust, primarily iron oxide, forms when iron reacts with moisture and oxygen. This change is indicated by the formation of a new substance, differing in properties from the original material.
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