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 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
Chemical Definition & Meaning | Britannica Dictionary
CHEMICAL meaning: 1 : of or relating to chemistry; 2 : working by means of chemicals
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 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 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 bonding
Chemical bonding - Covalent, Molecules, Atoms: When none of the elements in a compound is a metal, no atoms in the compound have an ionization energy low enough for
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
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 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