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Chemistry | Definition, Topics, Types, History, Facts | Britannica The identification of pure substances and the analysis of chemical mixtures enable all other chemical disciplines to flourish The importance of analytical chemistry has never been greater than it is today
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 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 formed by the reaction are called the products
Chemical energy | Definition Facts | Britannica The chemical energy in food is converted by the body into mechanical energy and heat The chemical energy in coal is converted into electrical energy at a power plant The chemical energy in a battery can also supply electrical power by means of electrolysis
Chemical bonding - Ionic, Covalent, Compounds | Britannica The difference between the two classes gave rise to the view that there are two types of chemical bond Electrolytes produce ions in solution; an ion is an electrically charged atom and transports its electric charge as it moves through a solution
The Epstein Files: A Timeline | Britannica The Epstein files are documents related to criminal charges of sex trafficking brought against Jeffrey Epstein His arrest and suicide fomented uproar over who may be named in the documents This timeline explores a scandal decades in the making