acetaldehyde
C2Technical / Scientific
Definition
Meaning
A colourless, flammable, volatile organic compound with the chemical formula CH3CHO, being the simplest aldehyde after formaldehyde.
A key intermediate in the metabolism of alcohol in the body, and an important industrial chemical used in the production of acetic acid, perfumes, and plastics.
Linguistics
Semantic Notes
The term is almost exclusively used in chemistry, biochemistry, medicine (regarding alcohol metabolism), and industrial contexts. It is not part of everyday vocabulary.
Dialectal Variation
British vs American Usage
Differences
No significant differences in meaning or usage. Spelling is identical. Minor potential differences in pronunciation stress.
Connotations
Neutral scientific term in both variants. In medical/biological contexts, often associated with the negative effects of alcohol metabolism (e.g., 'acetaldehyde toxicity').
Frequency
Extremely low frequency in general English. Its frequency is concentrated in specialised academic and technical texts, with no notable difference between UK and US corpora.
Vocabulary
Collocations
Grammar
Valency Patterns
The oxidation of X produces acetaldehyde.Acetaldehyde is a precursor to Y.The enzyme Z converts acetaldehyde into...Exposure to acetaldehyde causes...Vocabulary
Synonyms
Neutral
Weak
Usage
Context Usage
Business
Used in reports within chemical manufacturing, pharmaceuticals, or biofuel industries concerning production processes or safety data.
Academic
Core term in organic chemistry, biochemistry, toxicology, and chemical engineering papers and textbooks.
Everyday
Virtually never used. Might appear in advanced popular science articles about alcohol's effects.
Technical
The primary register. Used in lab reports, safety sheets (MSDS), industrial process descriptions, and clinical studies on alcoholism.
Examples
By CEFR Level
- Acetaldehyde is responsible for some of the negative symptoms of a hangover.
- This chemical process converts ethanol into acetaldehyde.
- The enzyme aldehyde dehydrogenase 2 is crucial for the efficient breakdown of acetaldehyde in the liver.
- Industrial production of acetic acid often involves the catalytic oxidation of acetaldehyde.
Learning
Memory Aids
Mnemonic
Think 'ACETate' (a related compound) + 'ALDEHYDE' (the chemical family). It's the 'ACE' aldehyde from ethanol.
Conceptual Metaphor
A TOXIC INTERMEDIARY / A CHEMICAL BUILDING BLOCK.
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- The Russian term 'ацетальдегид' is a direct cognate, so spelling and recognition are straightforward.
- Potential trap: confusing it with 'ацетон' (acetone), which is a different ketone compound.
Common Mistakes
- Misspelling as 'acetaldehide' or 'acetyldehyde'.
- Mispronouncing the 'ch' as /tʃ/ instead of /k/.
- Confusing it with formaldehyde or acetone.
Practice
Quiz
What is the primary industrial use of acetaldehyde?
FAQ
Frequently Asked Questions
Yes, it is toxic, flammable, and a suspected carcinogen. It causes irritation and is a key contributor to the adverse effects of alcohol consumption.
In the human body, the enzyme alcohol dehydrogenase (ADH) oxidises ethanol (drinking alcohol) to form acetaldehyde.
Yes, it occurs naturally in ripe fruit, coffee, and bread, and is also produced by plants as part of normal metabolism.
It is a versatile precursor in the synthesis of many chemicals, including acetic acid, pyridine, pentaerythritol, and certain plastics and resins.