
Reaction Definition & Meaning | Britannica Dictionary
REACTION meaning: 1 : the way someone acts or feels in response to something that happens, is said, etc.; 2 : an action or attitude that shows disagreement with or disapproval of someone …
Chemical reaction | Definition, Equations, Examples, & Types
Nov 30, 2025 · A chemical reaction is a process in which one or more substances, the reactants, are converted to one or more different substances, the products. Substances are either …
Chemical reaction - Precipitation, Reactants, Products | Britannica
Nov 30, 2025 · Chemical reaction - Precipitation, Reactants, Products: Formation of an insoluble compound will sometimes occur when a solution containing a particular cation (a positively …
Reaction formation | Description, Defense Mechanisms, Causes ...
Reaction formation occurs when a person experiences an unconscious thought, attitude, or desire that causes significant anxiety, possibly due to its perceived unacceptability according to …
Chemical reaction - Conservation, Reactants, Products | Britannica
Nov 30, 2025 · Chemical reaction - Conservation, Reactants, Products: In reactions under normal laboratory conditions, matter is neither created nor destroyed, and elements are not …
Cell - Coupled Reactions, Metabolism, Enzymes | Britannica
Oct 7, 2025 · When two molecules react with each other inside a cell, their atoms are rearranged, forming different molecules as reaction products and releasing or consuming energy in the …
Chemical reaction - Energy, Reactants, Products | Britannica
Nov 30, 2025 · Chemical reaction - Energy, Reactants, Products: Energy plays a key role in chemical processes. According to the modern view of chemical reactions, bonds between …
Oxidation-reduction reaction | Definition, Examples, & Facts
Nov 13, 2025 · oxidation-reduction reaction, any chemical reaction in which the oxidation number of a participating chemical species changes. The term covers a large and diverse body of …
chemical reaction - Students | Britannica Kids | Homework Help
A chemical reaction is a process in which one or more substances are converted to one or more different substances. In the reaction, the atoms of the starting substances are rearranged, …
Chemical reaction - Polymerization, Monomers, Polymers | Britannica
Nov 30, 2025 · There are two basic ways to form polymers: (a) linking small molecules together, a type of addition reaction, and (b) combining two molecules (of the same or different type) with …