reagent

Thân thiện

A scientist carefully adds a reagent to a test tube.

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.

Học thuật

Noun

1. a chemical agent for use in chemical reactions