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Chemistry | Definition, Topics, Types, History, Facts | Britannica Most of the materials that occur on Earth, such as wood, coal, minerals, or air, are mixtures of many different and distinct chemical substances Each pure chemical substance (e g , oxygen, iron, or water) has a characteristic set of properties that gives it its
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
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 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
list of chemical elements - Encyclopedia 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 Here, the elements are ordered alphabetically
chemical reaction - Students | Britannica Kids | Homework Help To describe chemical reactions, scientists use chemical equations, which make use of symbols and formulas for elements and compounds The chemical equation for the reaction between sodium and water would be written as follows: 2 Na + 2 H 2 O → 2 NaOH + H 2
chemistry - Kids | Britannica Kids | Homework Help The basic substances that chemists study are called chemical elements Each element is made up of tiny particles, or bits, called atoms Chemical reactions involve atoms or groups of atoms When two or more atoms combine, they form a molecule Each element has certain properties
Chemical synthesis | Organic Inorganic Reactions | Britannica chemical synthesis, the construction of complex chemical compounds from simpler ones It is the process by which many substances important to daily life are obtained It is applied to all types of chemical compounds, but most syntheses are of organic molecules