- 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 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
- Chemical reaction | Definition, Equations, Examples, Types - Britannica
Substances are either chemical elements or compounds A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products
- Chemical formula | Definition, Types, Examples, Facts | Britannica
Chemical formula, any of several kinds of expressions of the composition or structure of chemical compounds The forms commonly encountered are empirical, molecular, structural, and projection formulas
- chemical reaction - Students | Britannica Kids | Homework Help
The substances in a chemical reaction may be chemical elements, molecules, or compounds The substances present at the start of a chemical reaction are called the reactants; the substances formed by the reaction are called the products
- Natural gas - Composition, Properties, Uses | Britannica
Natural gas - Composition, Properties, Uses: Natural gas is a hydrocarbon mixture consisting primarily of saturated light paraffins such as methane and ethane, both of which are gaseous under atmospheric conditions The mixture also may contain other hydrocarbons, such as propane, butane, pentane, and hexane In natural gas reservoirs even the heavier hydrocarbons occur for the most part in
- Chemical weapon - WMD, Toxins, Agents | Britannica
Chemical weapon - WMD, Toxins, Agents: Chemical weapons did not become true weapons of mass destruction (WMD) until they were introduced in their modern form in World War I (1914–18)
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