Substances are either chemical elements or compounds If a physical change occurs, the physical properties of a substance will change, but its chemical identity will remain the same. A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products.
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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.
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. Of or relating to chemistry
Working by means of chemicals 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. This article begins by describing the historical evolution of the current understanding of chemical bonding and then discusses how modern theories of the formation of chemical bonds have emerged and developed into a powerful description of the structure of matter.
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 reactions differ from physical changes, which include changes of state, such as ice melting to water and water evaporating to vapor
