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WebE. Todd, in Encyclopedia of Food Sciences and Nutrition (Second Edition), 2003 Introduction. Contaminants in foods can be grouped according to their origin and nature. Essentially, these are microbiological (bacteria, viruses, parasites), extraneous matter (biological, chemical, physical), natural toxins (seafood toxins, mycotoxins), other chemical … A chemical substance is a form of matter having constant chemical composition and characteristic properties. Some references add that chemical substance cannot be separated into its constituent elements by physical separation methods, i.e., without breaking chemical bonds. Chemical substances can be simple … See more A chemical substance may well be defined as "any material with a definite chemical composition" in an introductory general chemistry textbook. According to this definition a chemical substance can either be a pure See more An element is a chemical substance made up of a particular kind of atom and hence cannot be broken down or transformed by a chemical reaction into a different element, though it can be transmuted into another element through a nuclear reaction. This is because all … See more All matter consists of various elements and chemical compounds, but these are often intimately mixed together. Mixtures contain more than one chemical substance, and they do not have a fixed composition. In principle, they can be separated into the … See more Every chemical substance has one or more systematic names, usually named according to the IUPAC rules for naming. An alternative … See more The concept of a "chemical substance" became firmly established in the late eighteenth century after work by the chemist Joseph Proust on the composition of some pure … See more A chemical compound is a chemical substance that is composed of a particular set of atoms or ions. Two or more elements combined into one substance through a chemical reaction See more While the term chemical substance is a precise technical term that is synonymous with chemical for chemists, the word chemical is used in general usage to refer to both (pure) chemical substances and mixtures (often called compounds), and especially when … See more WebLists of classified chemicals exist in several national legislations and regulations which provide information on local requirements in the handling of dangerous chemicals. The information for classification, and labels, may be obtained from tests, from literature, from practical experience and from information requirements by international rules on the … eyeko brow liner medium shape \u0026 define