What is the importance of laboratory knowledge
Chemicals are chemical compounds created by chemical processes. The production takes place in laboratories, technically in the chemical industry or in bioreactors.
The term chemical is very vague, by no means precisely defined and can therefore have different meanings depending on the context. For example, water, air, methane, coal, starch, ethanol, iron, silver, lime, baking powder, table salt, etc. are substances that laymen would not spontaneously consider chemicals, but are used in laboratories and industry just like "typical" chemicals . Potassium nitrate, sulfur, benzene would rather be classified as chemicals, even if they occur in nature and can be broken down there and were not produced in laboratories, chemical industry or bioreactors. Countless other "chemicals" occur naturally without being broken down: hydrochloric acid, urea, acetone, acetaldehyde. But perhaps only substances are considered chemicals that are also manufactured in the laboratory, chemical industry, etc.
Do a Google search for "What are chemicals?" (What are chemicals) in turn provides results such as: "Chemicals are defined as chemical elements and their compounds." (Chemicals are defined as chemical elements and their compounds). Accordingly, * all substances * would be chemicals.
When trading chemicals, there is often between Fine chemicals (high degree of purity) and technical chemicals (lower degree of purity). The designation heavy chemicals for inorganic base materials that are produced in large quantities (e.g. caustic soda and sulfuric acid) is also widespread. Around 80,000 chemicals are currently being produced industrially, of over 21 million chemical compounds that are registered with the Chemical Abstract Service (as of 2002). Every year over 400,000 new substances are described in the specialist literature worldwide.
Properties of individual chemicals can be looked up in the catalogs of the individual chemical manufacturers or in the major reference books such as Beilstein, Gmelin, Hager, Handbook, Kirk-Othmer, Landolt-Börnstein, Mellor, Merck Index, Nouveau Traités, Rodd, Ullmann and others .
List of chemicals,
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