chemical reaction

[kem-i-kuhl ree-ak-shuhn]

noun

1. Chemistry.,  reaction.

chemical reaction

noun

1. a process that involves changes in the structure and energy content of atoms, molecules, or ions but not their nuclei Compare nuclear reaction

chemical reaction

1. A process in which atoms of the same or different elements rearrange themselves to form a new substance. While they do so, they either absorb heat or give it off.

Word History and Origins

Origin of chemical reaction¹

First recorded in 1780–90

Example Sentences

This can be triggered by events from short-circuits to physical damage and manufacturing defects, and which allows heat-producing chemical reactions to start within the battery.

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Scientists believe these features contain minerals produced by chemical reactions that could be associated with ancient Martian microbes.

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An impromptu exchange on chemical reactions followed, with the judge probing her on laboratory processes.

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The room itself is about the size of a football pitch, and home to row after row of huge metal vats within which chemical reactions force the different rare earths apart.

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Firefighters let it burn, citing the dangers of dousing lithium-ion battery fires with water, which can cause dangerous chemical reactions.

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Related Words

• vicious circle