A chemical reaction is a process that leads to the transformation of one set of chemical substances to another. Classically, chemical reactions encompass changes that only involve the positions of electrons in the forming and breaking of chemical bonds between atoms, with no change to the nuclei (no change to the elements present), and can often b...
any type of chemical process in which substances are changed into different substances, as differentiated from other kinds of changes—those of ... [35 related articles]
A process that results in the interconversion of chemical species. Chemical reactions may be elementary reactions or stepwise reactions. (It should be noted that this definition includes experimentally observable interconversions of conformers.) Detectable chemical reactions normally involve sets of molecular entities, as indicated by this definiti...
A chemical process in which substances are changed into different substances with different properties.
<chemistry> A process in which one or more substances are changed chemically into one or more different substances. ... (09 Oct 1997) ... 
Interaction between chemicals in which there is a change in the chemical composition of the elements or compounds involved.
The transformation of substances by the rearrangement of their atoms
Chemical reaction: A process in which one substance is transformed into another. Thousands of different types of chemical reactions occur in the body and are essential to its structure and function.
Reaction between chemicals where there is a change in the chemical composition of the elements or compounds concerned.
The transformation of substances by the rearrangement of their atoms.
[n] - (chemistry) a process in which one or more substances are changed into others
reactions in which chemical bonds are formed or broken, and one or more substances change into entirely new substances with different properties
An event which causes a substance to change into a new substance
reaction noun (chemistry) a process in which one or more substances are changed into others; `there was a chemical reaction of the lime with the ground water`
a process in which substances are changed into others