A.................................
Explanation:
In spoken language, we are often careless in our use of words.
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Here, the definition is given and asked for a word that is defined.
The rearrangement of atoms by breaking and reforming chemical bonds is called a chemical reaction.
Hence, "chemical" is the missing word.
A <u>chemical</u> reaction is the rearrangement of atoms by breaking and reforming chemical bonds.
