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Final answer:
Chemical changes create new substances with different properties, while physical changes do not alter the substance's identity. Evidence of a chemical change includes color or temperature changes, gas formation, or precipitate formation.
Explanation:
Chemical changes occur when new substances are formed, with different properties from the original materials, and these changes are irreversible. On the other hand, physical changes alter the appearance of a substance without changing its molecular structure and are often reversible.
Chemical changes involve the transformation of one molecular substance into another, while physical changes do not alter the identity of the substance. Common evidence of a chemical change includes color change, temperature change, gas or precipitate formation, among others.
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