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- Chemistry | Definition, Topics, Types, History, Facts | Britannica
Chemistry is the science of the properties, composition, and structure of substances (defined as elements and compounds), the transformations they undergo, and the energy that is released or absorbed during these processes
- 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
- Chemical compound | Definition, Examples, Types | Britannica
Chemical compound, any substance composed of identical molecules consisting of atoms of two or more chemical elements 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 - Applications, Benefits, Impacts | Britannica
Chemistry has justly been called the central science Chemists study the various substances in the world, with a particular focus on the processes by which one substance is transformed into another Today, chemistry is defined as the study of the composition and properties of elements and compounds, the structure of their molecules, and the
- 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
- organic chemistry - Encyclopedia Britannica
Organic chemistry, field of science concerned with the composition, properties, and structure of chemical elements and compounds that contain carbon atoms Carbon is unique in the variety and extent of structures that can result from the three-dimensional connections of its atoms
- chemistry - Students | Britannica Kids | Homework Help
The science of chemistry is the study of matter and the chemical changes that matter undergoes Research in chemistry not only answers basic questions about nature but also affects people’s lives Chemistry has been used, for example, to make stronger metals, to enrich soil for growing crops, to destroy harmful bacteria, and to measure levels
- Acid | Definition, Examples, Types, Uses, Facts | Britannica
An acid is any substance that in water solution tastes sour, changes blue litmus paper to red, reacts with some metals to liberate hydrogen, reacts with bases to form salts, and promotes chemical reactions (acid catalysis)
- Inorganic compound | Definition Examples | Britannica
Inorganic compound, any substance in which two or more chemical elements (usually other than carbon) are combined, nearly always in definite proportions Compounds of carbon are classified as organic when carbon is bound to hydrogen
- 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
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