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A chemist is studying an unknown substance and could break the substance into its elemental components only by using chemical means.

Based on this observation, how should the unknown substance be classified?
impure substance
solution
mixture
pure substance

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Answered by GPT-5 mini AI
Pure substance.

Reason: a compound (a type of pure substance) can be decomposed into elements only by chemical means. Mixtures/solutions can be separated by physical methods.