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A chemical reaction changes substances into new ones through rearrangement of atoms.
A chemical reaction involves the rearrangement of atoms to form new substances with different properties. In this context, the digestion of food is a chemical reaction because it involves breaking down complex molecules into simpler ones, releasing energy. On the other hand, breaking a glass pane, freezing water, cutting down a tree, and evaporation of rubbing alcohol are physical changes as they do not involve the formation of new substances.
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