perchloromethane
Học thuậtThân thiện
Definition
Noun: A colorless, nonflammable, toxic liquid compound (CCl₄) used primarily as an industrial solvent for fats, oils, and other substances. Its use has declined significantly due to its toxicity and environmental impact.
Usage and Examples
As a chemical solvent:
- The laboratory used perchloromethane to dissolve the grease from the mechanical parts.
- This process involves extracting the compound using perchloromethane.
In historical or restricted applications:
- Due to its toxicity, perchloromethane is no longer recommended as a cleaning fluid.
- The old fire extinguisher contained perchloromethane, a substance now largely phased out.
Advanced Usage and Context
- Scientific and Industrial Context: The term is used almost exclusively in technical, scientific, or regulatory writing to refer to the specific chemical compound carbon tetrachloride. It describes a substance with specific properties (nonflammable, dense liquid) and a known hazardous profile.
- Regulatory and Safety Language: Often appears in documents discussing chemical safety, environmental regulations, or the history of industrial chemicals, highlighting its phased-out status.
- The protocol mandates the replacement of perchloromethane with a less hazardous alternative.
Variants and Related Words
- Carbon tetrachloride: This is the most common synonym and the name by which the compound is more widely known in scientific and industrial contexts.
- Tetrachloromethane: A systematic IUPAC name for the same compound, emphasizing its chemical structure (one carbon atom bonded to four chlorine atoms).
Synonyms
- Carbon tetrachloride
- Tetrachloromethane
- Benzinoform (an older, now rare name)
Important Notes (Not Idioms or Phrasal Verbs)
Given its nature as a specific chemical compound, perchloromethane does not have associated idioms or phrasal verbs. Its usage is literal and technical. The key point for learners is to understand it as a formal/technical term for a toxic chemical whose common use has been discontinued.
Noun
- a colorless nonflammable liquid used as a solvent for fats and oils; because of its toxicity its use as a cleaning fluid or fire extinguisher has declined