reagent
Definition
Noun: A substance or compound that is added to a system to cause a chemical reaction, or used to test for the presence, absence, or quantity of another substance. Reagents are fundamental tools in chemical analysis and synthesis.
Usage
A reagent is used to detect, measure, examine, or produce other substances in a chemical reaction. It is a prepared substance for use in a laboratory setting. - The laboratory technician prepared a fresh batch of the reagent for the experiment. - This test requires a specific reagent to indicate the presence of starch.
Advanced Usage
- Limiting Reagent: In a chemical reaction, the reactant that is completely consumed first, thus limiting the amount of product that can be formed.
- To calculate the theoretical yield, you must first identify the limiting reagent.
- Analytical Reagent (AR Grade): A high-purity chemical used in analytical chemistry and precise quantitative analysis.
- For this titration, only analytical reagent grade chemicals should be used.
Variants and Related Words
- Reactivity (n): The rate or capacity of a substance to undergo a chemical reaction.
- The metal's high reactivity requires it to be stored under oil.
- Reaction (n): A process in which substances change into different substances.
- The reaction produced a significant amount of heat.
Synonyms
- Reactant: A substance that takes part in and undergoes change during a reaction. (Note: While all reagents are reactants in a given context, not all reactants are prepared reagents; "reagent" often implies a prepared, known substance used for a specific purpose.)
- Test agent: A substance used to conduct a test.
- Chemical agent: A general term for a chemical substance used for a specific purpose.
Related Phrases and Terms
- Grignard reagent: An organometallic compound used in organic synthesis.
- The Grignard reagent was crucial for forming the new carbon-carbon bond.
- Reagent bottle: A container, often with a special stopper, designed for storing chemical reagents.
- Always label your reagent bottle clearly with the contents and concentration.
Noun
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a chemical agent for use in chemical reactions
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