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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.
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.
Salt | Chemistry, History, Occurrence, Manufacture, Uses, & Facts ...
Salt, also called sodium chloride, mineral substance of great importance to human and animal health, as well as to industry. The mineral form halite, or rock salt, is sometimes called common salt to distinguish it from a class of chemical compounds called salts. Learn more about salt in this article.
Cellular respiration | Definition, Equation, Cycle, Process, Reactants ...
Cellular respiration, the process by which organisms combine oxygen with foodstuff molecules, diverting the chemical energy in these substances into life-sustaining activities and discarding, as waste products, carbon dioxide and water.
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.
Hydrogen | Properties, Uses, & Facts | Britannica
The earliest known chemical property of hydrogen is that it burns with oxygen to form water; indeed, the name hydrogen is derived from Greek words meaning ‘maker of water.’
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.
Lead | Definition, Uses, Properties, & Facts | Britannica
What is lead as a chemical element? What does lead look like and what is its symbol on the periodic table? Where is lead found in nature? What are some uses of lead in everyday life?
Periodic table | Definition, Elements, Names, Symbols, Groups, Charges ...
The periodic table was created in 1869 and revised in 1871 by Russian chemist Dmitri Mendeleev, who placed elements in columns according to their chemical properties.
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