energy barrier

Energy Barrier - In this theory, the rate constant is related to three factors Z, f and p by the equation k = Zfp b (19) where Z is the collision frequency f is the fraction of collisions having energy greater than the threshold energy and p is the fraction o..

In this theory, the rate constant is related to three factors Z, f and p by the equation k = Zfp..

From Arrhenius equation, it is seen that the rate constant k of a reaction increases with temperature and therefore, the rate of reaction also increases. Why does k depend on temperature? This can be explained, to a certain extent, by collision theor..

. Collision theory explains the temperature dependence of rate of a reaction based specifically on the concept of effective collisions. However, collision theory does not account for the role of activation energy influencing the rate of a reaction. Another theory that was proposed a few y..

Concept of Activation Energy - For a reaction to occur, reactant molecules must collide with each other. Only those collisions result in product formation which have energy equal or more than a certain minimum energy. This energy is called the threshold ..

From Arrhenius equation, it is seen that the rate constant k of a reaction increases with temperature and therefore, the rate of reaction also increases. Why does k depend on temperature? This can be explained, to a certain extent, by collision theory. According to this theory, a chemical reaction..

Photochemical Reactions - There are many reactions that are affected by electromagnetic radiations. Chemical reactions, which occur in the presence of visible and ultraviolet light are called photochemical reactions. Photochemical reactions occur only when photons of radiant energy (h n )..

The biotic and abiotic components form an interacting system called 'ecosystem'. Producers, consumers and decomposers are the various trophic levels, which are linked by their food relationship forming a 'food chain'. Several food chains are interrelated and interconnected to form a network called ..

In view of the symmetry of the sigma bond, it is surprising that perfectly free rotation in ethane is not observed. Experiments show that there is a slight (2.9 kcal/mol) barrier to rotation due to the fact that some conformations are more stable than others. The lowest-energy,..

Summary - All vibrating and oscillating bodies are described by the length of time required for one complete cycle. Time period (T) is the reciprocal of frequency (f). Vibrations and oscillations are also characterised by terms like amplitude of vibrations which is actually the maximum distance the..