collision theory

collision theory

      theory used to predict the rates of chemical reactions, particularly for gases. The collision theory is based on the assumption that for a reaction to occur it is necessary for the reacting species (atoms or molecules) to come together or collide with one another. Not all collisions, however, bring about chemical change. A collision will be effective in producing chemical change only if the species brought together possess a certain minimum value of internal energy, equal to the activation energy of the reaction. Furthermore, the colliding species must be oriented in a manner favourable to the necessary rearrangement of atoms and electrons. Thus, according to the collision theory, the rate at which a chemical reaction proceeds is equal to the frequency of effective collisions. Because atomic or molecular frequencies of collisions can be calculated with some degree of accuracy only for gases (by application of the kinetic theory), the application of the collision theory is limited to gas-phase reactions.

* * *


Universalium. 2010.

Игры ⚽ Нужно сделать НИР?

Look at other dictionaries:

  • Collision theory — Reaction rate tends to increase with concentration phenomenon explained by collision theory Collision theory is a theory proposed by Max Trautz[1] and William Lewis in 1916 and 1918, that qualitatively explains how chemical reactions occur and… …   Wikipedia

  • collision theory — susidūrimų teorija statusas T sritis fizika atitikmenys: angl. collision theory; impact theory vok. Stoßtheorie, f rus. теория столкновений, f pranc. théorie des chocs, f; théorie des collisions, f …   Fizikos terminų žodynas

  • collision theory — noun Any theory that relates collisions among particles to reaction rate; reaction rate depends on such factors as concentration, surface area, temperature, stirring, and the presence of either a catalyst or an inhibitor …   Wiktionary

  • collision-theory — adjective noun …   Wiktionary

  • Collision frequency — Main article: Collision theory Collision frequency is defined in chemical kinetics, in the background of theoretical kinetics, as the average number of collisions between reacting molecules per unit of time. Its symbol is Z. For a gas phase… …   Wikipedia

  • Collision Course (album) — Collision Course EP by Jay Z and Linkin Park Released November 30 …   Wikipedia

  • Collision Course — Collision Course …   Википедия

  • Collision Course — EP par Jay Z Linkin Park Sortie 29 novembre 2004 30 novembre 2004 …   Wikipédia en Français

  • Collision — For other uses, see Collision (disambiguation). A collision is an isolated event which two or more moving bodies (colliding bodies) exert forces on each other for a relatively short time. Although the most common colloquial use of the word… …   Wikipedia

  • Collision cascade — A classical molecular dynamics computer simulation of a collision cascade in Au induced by a 10 keV Au self recoil. This is a typical case of a collision cascade in the heat spike regime. Each small sphere illustrates the position of an atom, in… …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”