chemical change: meaning, definition, pronunciation and examples
B2Technical/Scientific
Quick answer
What does “chemical change” mean?
A process in which one or more substances are transformed into different substances with new chemical properties, involving the breaking and forming of chemical bonds.
Audio
Pronunciation
Definition
Meaning and Definition
A process in which one or more substances are transformed into different substances with new chemical properties, involving the breaking and forming of chemical bonds.
Any process where the molecular composition or atomic structure of a substance is altered, resulting in a new material. It can be irreversible or reversible under specific conditions, and is often accompanied by observable signs like colour change, gas production, temperature change, or precipitate formation.
Dialectal Variation
British vs American Usage
Differences
No significant lexical or conceptual differences. Both varieties use the term identically in scientific contexts. Spelling of related words may follow regional conventions (e.g., colour/color).
Connotations
Identical in both varieties: strictly scientific/educational.
Frequency
Equally frequent in educational and scientific contexts in both regions.
Grammar
How to Use “chemical change” in a Sentence
Noun + undergo + chemical changeChemical change + occur + in + nounNoun + result + from + chemical changeChemical change + involve + nounVocabulary
Collocations
Examples
Examples of “chemical change” in a Sentence
verb
British English
- The compound **chemically changes** when exposed to sunlight.
- These substances do not **chemical-change** easily.
American English
- The mixture **chemically changes** under high pressure.
- This polymer can **chemical-change** over time.
adverb
British English
- The material reacted **chemical-change-ly** (Note: Highly unnatural; standard English lacks a direct adverbial form. Use 'chemically' instead).
American English
- The substance altered **chemical-change-ly** (Note: Highly unnatural; standard English lacks a direct adverbial form. Use 'chemically' instead).
adjective
British English
- The **chemical-change** process is exothermic.
- We observed **chemical-change** phenomena in the lab.
American English
- The **chemical-change** properties were documented.
- A **chemical-change** indicator was used in the experiment.
Usage
Meaning in Context
Business
Rare, except in industries like pharmaceuticals, chemicals, or materials manufacturing, e.g., 'The new catalyst speeds up the chemical change, improving yield.'
Academic
Central in chemistry, materials science, and biology education and research, e.g., 'The study focuses on the chemical changes during cellular respiration.'
Everyday
Used in simplified explanations, cooking (e.g., baking), rusting, or battery use, e.g., 'Burning wood involves a chemical change.'
Technical
Precise use in laboratory reports, engineering specifications, and scientific papers, e.g., 'The IR spectroscopy confirmed the chemical change in the polymer matrix.'
Vocabulary
Synonyms of “chemical change”
Strong
Neutral
Weak
Vocabulary
Antonyms of “chemical change”
Watch out
Common Mistakes When Using “chemical change”
- Using 'chemical change' to describe dissolving or phase changes (melting, boiling), which are physical changes.
- Confusing 'chemical change' with 'chemical property'. A property is a characteristic, a change is a process.
- Misspelling as 'chemcial change'.
FAQ
Frequently Asked Questions
No. While many common chemical changes (like burning or rusting) are irreversible, some are reversible under specific conditions. These are called reversible reactions.
A chemical change produces new substances with different chemical properties, while a physical change only alters the form or state of a substance without changing its chemical identity.
You often observe the *evidence* of a chemical change (like colour change, gas bubbles, temperature change, or precipitate formation), but you cannot see the actual breaking and forming of bonds at the molecular level without special equipment.
Yes, digestion involves complex chemical changes where enzymes break down large food molecules (like proteins and carbohydrates) into smaller molecules that the body can absorb.
A process in which one or more substances are transformed into different substances with new chemical properties, involving the breaking and forming of chemical bonds.
Chemical change is usually technical/scientific in register.
Chemical change: in British English it is pronounced /ˈkɛmɪkəl tʃeɪndʒ/, and in American English it is pronounced /ˈkɛmɪkəl tʃeɪndʒ/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “[No common idioms for this technical term]”
Learning
Memory Aids
Mnemonic
CHEMICAL CHANGE = Composition Has Entirely Modified, Creating A Largely Different Compound; A New Group Emerges.
Conceptual Metaphor
REBIRTH / METAMORPHOSIS (Old substances 'die' and new ones are 'born'). TRANSMUTATION (Changing into something fundamentally different).
Practice
Quiz
Which of the following is the BEST example of a chemical change?