Question

why rusting of iron is a chemical change

Answer 1

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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.

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Answer 2

When the iron gets rusted, its chemical properties change.

Iron + Water + Oxygen -> hydrated iron oxide (III)

Therefore, rusting of iron is a chemical change.