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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
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
chemical element - Students | Britannica Kids | Homework Help Any substance that cannot be decomposed into simpler substances by ordinary chemical processes is defined as a chemical element Only 94 such substances are known to exist in nature (and two of them occur in only trace amounts)
Chemical engineering | Processes, Principles Applications | Britannica Chemical engineering, the development of processes and the design and operation of plants in which materials undergo changes in their physical or chemical state Applied throughout the process industries, it is founded on the principles of chemistry, physics, and mathematics
periodic table - Encyclopedia Britannica The periodic table is a tabular array of the chemical elements organized by atomic number, from the element with the lowest atomic number, hydrogen, to the element with the highest atomic number, oganesson