chemical
C1Neutral to Formal (common in scientific, technical, academic, industrial, and news registers)
Definition
Meaning
A substance produced by or used in a chemical process, having a specific molecular composition.
Pertaining to chemistry, or relating to the properties, interactions, and reactions of substances.
Linguistics
Semantic Notes
Primarily a noun, also commonly used as an adjective. As a noun, typically countable ('chemicals'), referring to specific substances. The adjective form describes a relation to chemistry or the properties/composition of matter.
Dialectal Variation
British vs American Usage
Differences
Minimal. Both use 'chemical' identically. Potential minor spelling in compounds (e.g., 'chemicals' always with 's'). Pronunciation differs (see IPA).
Connotations
Equally neutral in scientific contexts. In public discourse (e.g., 'chemicals in food'), can carry equally negative connotations of artificiality or danger.
Frequency
Equally high frequency in both varieties due to shared scientific/industrial lexicon.
Vocabulary
Collocations
Grammar
Valency Patterns
chemical + noun (adj: chemical reaction)verb + chemical (use/handle/produce a chemical)adjective + chemical (organic/industrial/toxic chemical)chemical + of + type (chemical of concern)Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “A chemical reaction (figurative: a strong, immediate interaction between people)”
- “Chemical imbalance (medical/psychiatric term for a theorised cause of mood disorders)”
Usage
Context Usage
Business
Refers to products, commodities, or the industry sector (e.g., 'The chemical market is volatile.').
Academic
Central term in chemistry, biology, pharmacology, and materials science (e.g., 'The chemical properties were analysed.').
Everyday
Often refers to cleaning products, artificial additives, or pollutants (e.g., 'I avoid foods with chemicals.').
Technical
Precise reference to specific substances, reactions, or processes (e.g., 'The effluent contained trace chemicals.').
Examples
By Part of Speech
verb
British English
- (Rare as verb) The compound was chemically altered in the process.
American English
- (Rare as verb) The material was chemically treated to resist water.
adverb
British English
- (Use 'chemically') The surfaces are chemically bonded.
- The two substances are chemically similar.
American English
- (Use 'chemically') The waste was chemically neutralised.
- The samples were chemically analysed.
adjective
British English
- The plant underwent a chemical change.
- He works in the chemical sector.
American English
- The factory caused chemical pollution.
- She has a background in chemical engineering.
Examples
By CEFR Level
- Be careful with cleaning chemicals.
- Water is a chemical.
- The chemical smell was very strong.
- The factory produces industrial chemicals.
- A chemical reaction occurs when you mix them.
- Farmers use chemicals to protect crops.
- The government regulates the disposal of hazardous chemicals.
- Researchers identified the chemical's precise molecular structure.
- The accident resulted in a major chemical spill.
- The treaty aims to curb the proliferation of chemical weapons.
- Advancements in chemical engineering have revolutionised drug synthesis.
- The study posits a complex interplay of biochemicals influencing behaviour.
Learning
Memory Aids
Mnemonic
Think of 'CHEM lab' – a CHEMical is what you study and use in a CHEMistry laboratory.
Conceptual Metaphor
CHEMICALS ARE AGENTS (they act, react, cause effects); CHEMISTRY IS A LANGUAGE (with formulas as sentences and reactions as conversations).
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Avoid using 'chemistry' (химия) to mean a single substance. In English, 'chemistry' is the science, 'chemical' is the substance.
- The adjective 'chemical' (химический) is often used where Russian might use a noun (e.g., 'chemical industry' vs 'химическая промышленность').
- Beware of false friend 'reagent' (реагент) – in English it's a more specific technical term, not a general synonym for 'chemical'.
Common Mistakes
- Using 'chemistry' as a countable noun for a substance (e.g., *'This food has bad chemistries'*).
- Confusing 'chemical' (adj/noun) with 'chemically' (adverb).
- Overusing 'chemical' with negative connotations in non-technical speech, implying all chemicals are bad.
Practice
Quiz
In which sentence is 'chemical' used as an adjective?
FAQ
Frequently Asked Questions
No, but it often has a negative connotation in casual contexts (e.g., 'chemicals in food'). In scientific contexts, it is neutral. Everything is made of chemicals, including water and oxygen.
All compounds are chemicals, but not all chemicals are compounds. A 'chemical' is a broad term for any substance with a defined composition. A 'compound' is a specific type of chemical made from two or more different elements bonded together.
Extremely rarely and it is non-standard. The usual verb forms are 'to treat with chemicals' or 'to chemically process'. The adverb 'chemically' is common.
Yes, when referring to a specific substance ('a dangerous chemical'). The plural 'chemicals' is very common when referring to multiple substances or types.
Collections
Part of a collection
Environment
B1 · 47 words · Nature, ecology and environmental issues.
Science and Technology
B1 · 47 words · Basic scientific concepts and modern technology.
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