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physical change vs. chemical change

[ fiz-i-kuhl cheynj ]
  1. a usually reversible change in the physical properties of a substance, as size or shape: Freezing a liquid is a physical change.
[ kem-i-kuhl cheynj ]
  1. a usually irreversible chemical reaction involving the rearrangement of the atoms of one or more substances and a change in their chemical properties or composition, resulting in the formation of at least one new substance: The formation of rust on iron is a chemical change.

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