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Chemistry | Definition, Topics, Types, History, Facts | Britannica The identification of pure substances and the analysis of chemical mixtures enable all other chemical disciplines to flourish The importance of analytical chemistry has never been greater than it is today
Chemical element | Definition, Origins, Distribution, Facts - Britannica A chemical element is any substance that cannot be decomposed into simpler substances by ordinary chemical processes Elements are the fundamental materials of which all matter is composed Learn more about the origins, distribution, and characteristics of chemical elements in this article
Chemical formula | Definition, Types, Examples, Facts | Britannica Chemical formula, any of several kinds of expressions of the composition or structure of chemical compounds The forms commonly encountered are empirical, molecular, structural, and projection formulas
Chemical industry | Overview, Importance, History | Britannica Chemical industry, complex of processes, operations, and organizations engaged in the manufacture of chemicals and their derivatives Raw materials include fossil fuels and inorganic chemicals
Chemical Weapons Convention (CWC) | Britannica Chemical Weapons Convention (CWC), international treaty that bans the use of chemical weapons in war and prohibits all development, production, acquisition, stockpiling, or transfer of such weapons
Chemical energy | Definition Facts | Britannica The chemical energy in food is converted by the body into mechanical energy and heat The chemical energy in coal is converted into electrical energy at a power plant The chemical energy in a battery can also supply electrical power by means of electrolysis
chemical reaction - Students | Britannica Kids | Homework Help The substances in a chemical reaction may be chemical elements, molecules, or compounds The substances present at the start of a chemical reaction are called the reactants; the substances formed by the reaction are called the products