Boiling water demonstrates a physical change as the molecular structure remains the same despite phase alterations.
Physical change: boiling and melting do not break or form bonds, maintaining the substance's molecular structure. For instance, when water boils (H2O(l) → H2O(g)), it undergoes a physical change.
Chemical change: a chemical change involves transforming substances into different ones. Gas formation in water doesn't alter its molecular composition, signifying a physical, not chemical, change.
Phase change: altering temperature can trigger phase changes, like liquid water becoming water vapor, without altering the substance's identity.
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