- 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
- Sodium - Chemical Properties, Reactions, Uses | Britannica
A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products Chemical reactions are an integral part of technology, of culture, and indeed of life itself
- Chemical compound - Elements, Molecules, Reactions | Britannica
Chemical compound - Elements, Molecules, Reactions: Chemical compounds may be classified according to several different criteria One common method is based on the specific elements present
- Periodic table | Definition, Elements, Groups, Charges, Trends, Facts . . .
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
- 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
- Lipid | Definition, Structure, Examples, Functions, Types, Facts . . .
This section describes the structure and physical and chemical properties of fatty acids It also explains how living organisms obtain fatty acids, both from their diets and through metabolic breakdown of stored fats
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