CHEMICAL definition: 1. any basic substance that is used in or produced by a reaction involving changes to atoms or…. Learn more. Chemicalbook is a platform dedicated to provide the most valuable resources for chemical industry users. Here you can get chemical information (such as chemical physical properties, safety data, Excellent china suppliers and their web addresses and etc.)by searching the name, CAS number, molecular formula, molecular weight, MDL number, EINECS number, structure. PubChem is the world's largest collection of freely accessible chemical information. Search chemicals by name, molecular formula, structure, and other identifiers. Find chemical and physical properties, biological activities, safety and toxicity information, patents, literature citations and more. Chemical Abstracts Service (CAS) lists several alloys of uncertain composition within their chemical substance index. [5] While an alloy could be more closely defined as a mixture, referencing them in the chemical substances index allows CAS to offer specific guidance on standard naming of alloy compositions. Non-stoichiometric compounds are another special case from inorganic chemistry, which. Chemistry is the science of the properties, composition, and structure of substances (defined as elements and compounds), the transformations they undergo, and the energy that is released or absorbed during these processes. Chemistry is concerned with the properties of atoms and the laws governing their combinations. The Nuclear Regulatory Commission's Science 101: What is a Chemical? A chemical is any substance that has a defined composition. In other words, a chemical is always made up of the same stuff. Some chemicals occur in nature, such as water. Other chemicals are manufactured, such as chlorine (used for bleaching fabrics or in swimming pools). A chemical is matter with a defined composition. What is a chemical? In science, a chemical is any substance with a specific composition, whether it’s a single element or a compound of multiple elements. While people often think of “chemicals” as synthetic or harmful substances, the truth is that everything around you, including water, air, and even your own body, consists of chemicals. Chemistry is the scientific study of the properties and behavior of matter. [1] [page needed][2][page needed] It is a physical science within the natural sciences that studies matter: composition, structure, properties, behavior and the changes they undergo during reactions with other substances. [3][4][5][better source needed][6] Chemistry also addresses the nature of chemical bonds in. CHEMICAL definition: a substance produced by or used in a chemical process. See examples of chemical used in a sentence. The meaning of CHEMICAL is of, relating to, used in, or produced by chemistry or the phenomena of chemistry. How to use chemical in a sentence.