Chemical reaction | Definition, Equations, Examples, & Types
Oct 28, 2024 · Chemists classify chemical reactions in a number of ways: by type of product, by types of reactants, by reaction outcome, and by reaction mechanism. Often a given reaction can be placed in two or even three categories, including gas -forming and precipitation reactions.
Chemistry | Definition, Topics, Types, History, & Facts | Britannica
Nov 5, 2024 · Chemistry, the science of the properties, composition, and structure of substances (defined as elements and compounds), the transformations they undergo, and the energy that is released or absorbed during these processes.
Chemical kinetics | Definition, Equations, & Facts | Britannica
5 days ago · Chemical kinetics, the branch of physical chemistry that is concerned with understanding how fast or how slow chemical reactions occur (that is, their rates). The principles of chemical kinetics apply to purely physical processes as well as to chemical reactions.
Chemistry, Classification, & Chemical Reactions - Britannica
Oct 11, 2024 · Catalysis, the modification of the rate of a chemical reaction, usually an acceleration, by addition of a substance not consumed during the reaction. Each catalyst molecule may induce the transformation of many molecules of reactants. Learn about the history, classification, and reactions of catalysis.
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.
Combustion | Definition, Reaction, Analysis, & Facts | Britannica
Oct 3, 2024 · combustion, a chemical reaction between substances, usually including oxygen and usually accompanied by the generation of heat and light in the form of flame.
Chemical reaction - Energy, Reactants, Products | Britannica
Oct 28, 2024 · Chemical reaction - Energy, Reactants, Products: Energy plays a key role in chemical processes. According to the modern view of chemical reactions, bonds between atoms in the reactants must be broken, and the atoms or pieces of molecules are reassembled into products by forming new bonds.
Electrochemical reaction | Definition, Process, Types, Examples ...
Electrochemical reaction, any process either caused or accompanied by the passage of an electric current and involving in most cases the transfer of electrons between two substances—one a solid and the other a liquid. Under ordinary conditions, the occurrence of a chemical reaction is accompanied.
Chemistry - Analysis, Reactions, Compounds | Britannica
Nov 5, 2024 · Over the years, chemists have discovered chemical reactions that indicate the presence of such elemental substances by the production of easily visible and identifiable products. Iron can be detected by chemical means if it is present in a sample to an amount of 1 part per million or greater.
Chemistry - Elements, Reactions, Revolution | Britannica
Nov 5, 2024 · Atomic and molecular theory. Lavoisier’s set of chemical elements, and the new way of understanding chemical composition, proved to be invaluable for analytic and inorganic chemistry, but in a real sense the chemical revolution had only just begun.