chemical reaction

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

noun

1. Chemistry. reaction ( def 7 ).

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

They introduced an iodine-reducing agent to inhibit the chemical reactions that cause the cells to degrade over time.

From Science Daily

These high concentrations result in unique chemical reactions within cancer cells that render the cells more vulnerable to chemo- and radiation therapies.

From Science Daily

The team used electrocatalysis, a type of chemical reaction initiated by electron transfers to and from reactants on surfaces of catalysts, to convert carbon dioxide into biocompatible intermediates, such as acetate and ethanol.

From Science Daily

It is a chemical reaction that requires intense heat, and which emits high levels of carbon into the atmosphere.

From BBC

The air inside the tire combines with the heat, starting a chemical reaction powerful enough to create a violent shock wave.

From Los Angeles Times

Related Words

• vicious circle