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Chemical Definition & Meaning | Britannica Dictionary
CHEMICAL meaning: 1 : of or relating to chemistry; 2 : working by means of chemicals
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 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.
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 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. A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products.
Boron | Properties, Uses, & Facts | Britannica
Boron, chemical element that is a semimetal essential to plant growth and of wide industrial application. Typical effects of long-term boron deficiency are stunted, misshapen growth; vegetable ‘brown heart’ and sugar beet ‘dry rot’ are among the disorders due to boron deficiency.
Iodine | Chemical Properties, Uses, & Applications | Britannica
Iodine, chemical element, a member of the halogen elements, or Group 17 (Group VIIa) of the periodic table.
Chemical change | Britannica
A chemical change (that is, a chemical reaction) is one in which the organization of the atoms is altered. An example of a chemical reaction is the burning of methane in the presence of molecular oxygen (O2) to form carbon dioxide (CO2) and…
Bromine | Properties, Uses, & Facts | Britannica
What is bromine? What does bromine look like and where can it be found? What are the basic chemical properties of bromine? How is bromine used in industry or everyday life?
Chemical bonding | Definition, Types, & Examples | Britannica
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.
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