chemical reaction

Chemistry, reaction ( def 7 ). Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
chemical reaction
Compare nuclear reaction a process that involves changes in the structure and energy content of atoms, molecules, or ions but not their nuclei

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Cultural Dictionary

chemical reaction definition

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.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
The compound is essential for photosynthesis, a chemical reaction that converts
  sunlight into carbohydrates.
The fluid travels through the channels and a chemical reaction occurs that
  causes the spot to change color.
But the whole process of ion movement and chemical reaction is slower than the
  movement of electrons in a capacitor.
When a battery is connected to a load, a chemical reaction begins.
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