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,

2025 Dec 21

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

2025 Jul 15

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

2024 Mar 16

Chemical Definition & Meaning | Britannica Dictionary

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

2024 May 11

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.

2024 Sep 30

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,

2024 Aug 27

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

2025 May 20

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

2024 Sep 02

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.

2025 Sep 24

Chemical Weapons Convention (CWC) | Britannica

Chemical Weapons Convention (CWC), international treaty that bans the use of chemical weapons in war and prohibits all development, production, acquisition, stockpiling, or transfer

2025 May 12

View/Download Chemical battery energy storage [PDF]

PDF version includes complete article with source references. Suitable for printing and offline reading.