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Chemistry | Definition, Topics, Types, History, & Facts | Britannica
The identification of pure substances and the analysis of chemical mixtures enable all other chemical disciplines to flourish. The importance of analytical chemistry has never been greater than it is today.
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.
DNA | Definition, Discovery, Function, Bases, Facts, & Structure ...
DNA is an organic chemical of complex molecular structure found in all prokaryotic and eukaryotic cells. It codes genetic information for the transmission of inherited traits.
DDT | Description, History, Effects, Uses, Banned, & Facts | Britannica
The chemical was widely used, though many species of insects rapidly developed resistant populations. As a result of repeated sprayings, DDT accumulated in soils in surprisingly large amounts (10–112 kilograms per hectare [10–100 pounds per acre]). Its effects on wildlife greatly increased as it became associated with food chains.
Interactive Periodic Table of the Elements | Symbols, Atomic Weights ...
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.
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.
Periodic table | Definition, Elements, Groups, Charges, Trends, & Facts ...
Periodic table, in chemistry, is an organized array of all the chemical elements in order of increasing atomic number. When the elements are thus arranged, there is a recurring pattern called the ‘periodic law’ in their properties, in which elements in the same column (group) have similar properties.
Oxalic acid | Formula, Uses, & Facts | Britannica
oxalic acid chemical compound Also known as: ethanedioic acid Written and fact-checked by The Editors of Encyclopaedia Britannica
Air | Composition, Oxygen, Nitrogen | Britannica
The typical concentration ranges of these gases (in percentage by volume) are as follows: Key People: Carl von Linde Henry Cavendish Robert Boyle Anaximenes Of Miletus Ctesibius Of Alexandria Related Topics: chemical element atmosphere air-cushion machine hydrogen compressed air
Naphtha | Petroleum, Hydrocarbon, Refining | Britannica
naphtha Introduction References & Edit History Related Topics Contents Technology Industry Chemical Products
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