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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 compound | Definition, Examples, & Types | Britannica
All the matter in the universe is composed of the atoms of more than 100 different chemical elements, which are found both in pure form and combined in chemical compounds.
Chemical reaction | Definition, Equations, Examples, & Types - Britannica
A chemical reaction is a process in which one or more substances, the reactants, are converted to one or more different substances, the products. Substances are either chemical elements or compounds.
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 weapon - Nerve Agents, Toxins, Warfare | Britannica
Chemical weapon - Nerve Agents, Toxins, Warfare: The most lethal and important chemical weapons contain nerve agents, which affect the transmission of impulses through the nervous system.
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.
Melamine | Industrial, Food & Medical Applications | Britannica
Evidence of misuse of the chemical in China emerged in 2007, when more than 4,000 dogs and cats in the United States died from kidney failure as a result of ingesting melamine-tainted pet food.
chemical energy - Kids | Britannica Kids | Homework Help
People have invented ways to use the chemical energy of substances to power machines. For example, the chemical energy inside the substances in a battery can be transformed into electrical energy to power a flashlight.
Mineral - Classification, Properties, Types | Britannica
Chemical composition and internal structure together constitute the essence of a mineral and determine its physical properties; thus, classification should rely on both.
Chemical reaction - Energy, Reactants, Products | Britannica
Chemical reaction - Energy, Reactants, Products: Energy plays a key role in chemical processes. According to the modern view of chemical reactions, bonds between atoms in the reactants must be broken, and the atoms or pieces of molecules are reassembled into products by forming new bonds.
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