Question
one example of chemical change
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Rusting of iron — when iron reacts with oxygen (and moisture) to form iron oxide (rust).
Example reaction (simplified): 4 Fe + 3 O2 → 2 Fe2O3 (often forms hydrated Fe2O3·nH2O).
Why it's a chemical change: a new substance with different properties (reddish-brown powder) is formed, the process is not easily reversible, and it involves a chemical reaction between iron and oxygen.
Example reaction (simplified): 4 Fe + 3 O2 → 2 Fe2O3 (often forms hydrated Fe2O3·nH2O).
Why it's a chemical change: a new substance with different properties (reddish-brown powder) is formed, the process is not easily reversible, and it involves a chemical reaction between iron and oxygen.