In chemistry,<unk>  is purposeful execution of chemical reactions in order to get a product, or several products. This happens by physical and chemical manipulations usually involving one or more reactions. In modern laboratory usage, this tends to imply that the process is reproducible, reliable, and established to work in multiple laboratories.
A<unk>  begins by selection of compounds that are known as reagents or reactants. Various reaction types can be applied to these to<unk> e the product, or an intermediate product. The amount of product in a<unk>  is the reaction yield. Typically, chemical yields are expressed as a weight in grams or as a percentage of the total theoretical quantity of product that could be produced. A side reaction is an unwanted chemical reaction taking place that diminishes the yield of the desired product.
The word<unk>  in the present day meaning was first used by the chemist Adolph Wilhelm Hermann Kolbe.
Chemical synthesis
Chemical engineering
Clinical engineering
Cryogenics
Drug design
Biological engineering
Sterilization 
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