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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,

Chemical reaction | Definition, Equations, Examples, & Types

Substances are either chemical elements or compounds. A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products.

Chemical industry | Overview, Importance, & History | Britannica

Chemical industry, complex of processes, operations, and organizations engaged in the manufacture of chemicals and their derivatives. Raw materials include fossil fuels and

chemical reaction

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

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.

Interactive Periodic Table of the Elements | Symbols, Atomic

The rate at which chemical knowledge continues to accumulate is remarkable. Over time more than 8,000,000 different chemical substances, both natural and artificial, have been

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,

Chemical energy | Definition & Facts | Britannica

Chemical reactions differ from physical changes, which include changes of state, such as ice melting to water and water evaporating to vapor. If a physical change occurs, the physical

Chemical Definition & Meaning | Britannica Dictionary

CHEMICAL meaning: 1 : of or relating to chemistry; 2 : working by means of chemicals

Chemical element | Definition, Origins, Distribution, & Facts

A chemical element is any substance that cannot be decomposed into simpler substances by ordinary chemical processes. Elements are the fundamental materials of which