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Chemistry | Definition, Topics, Types, History, Facts | Britannica Cooking, fermentation, glass making, and metallurgy are all chemical processes that date from the beginnings of civilization Today, vinyl, Teflon, liquid crystals, semiconductors, and superconductors represent the fruits of chemical technology
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 energy | Definition Facts | Britannica Chemical reactions differ from physical changes, which include changes of state, such as ice melting to water and water evaporating to vapor If a physical change occurs, the physical properties of a substance will change, but its chemical identity will remain the same
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
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 element - Atomic Structure, Periodic Table, Properties . . . The main problem concerned with the origin of the chemical elements is to decide to what extent the chemical composition of the stars seen today differs from the initial chemical composition of the universe and to determine where the change in chemical composition has been produced