chemical change

[ kem-i-kuhl cheynj ]

Phonetic (Standard)IPA

noun

Chemistry. a usually irreversible chemical reaction involving the rearrangement of the atoms of one or more substances and a change in their chemical properties or composition, resulting in the formation of at least one new substance:
The formation of rust on iron is a chemical change.

First recorded in 1755–65

The organic remains met with in the rocks have usually undergone some chemical change.

During the roasting process the coffee undergoes a great chemical change.

Where the particles touch each other, there is such a chemical change produced as renders them fit for the use of plants.

A chemical change must take place in it and the nitrogen be built into nitric acid and nitrates.

We do not want to dry cheese; we want to cure it; that is, let it go through the proper chemical change.

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