Substances with distinct molecular composition that are produced by or used in chemical processes. Can be naturally occurring or artificially manufactured compounds used in industry, medicine, or research.
From 'chemical', derived from 'chemist' and ultimately from Arabic 'al-kīmiyā' (alchemy), through Medieval Latin 'alchemia'. The word evolved from mystical alchemical practices to modern scientific chemistry, reflecting humanity's growing understanding of matter.
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