化学试剂
Also known as reagent, analytical reagent
thumb|Reagents, such as sulfur (pictured), are the starting materials used in chemical reactions.
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A chemical reagent is a substance used as a starting material in chemical reactions to create new compounds or test for the presence of other substances. Reagents matter because they're essential tools for everything from scientific research and drug development to quality testing and manufacturing processes.
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Article · 中文
反应物（在生物中称作底物或受质）指的是化学反应中消耗的物质。虽然化学反应中一般也涉及溶剂和催化剂，然而它们通常不被算作反应物。 试剂更强调该种化学物质的某种特定用途。
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