Heres a more detailed comparison:
AspectPhysical ChangeChemical Change
**Substance formed**No new substance. The molecules remain the same, only state, shape, or size changes. Ex: Cutting paper, melting waxNew substance with different chemical composition and properties. Ex: Rusting of iron forms $Fe_2O_3$, burning wood forms ash + gases
**Reversibility**Usually reversible by simple physical means. Ex: Water to ice and back by freezing/meltingUsually irreversible or needs another chemical reaction to reverse. Ex: Cooked egg cannot become raw egg again
*Quick test*: If the chemical formula of the substance changes, its chemical. If only the form changes, its physical.
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