7 posts • Page 1 of 1
The pre-exponential factor (A) is part of the Arrhenius equation, which was formulated by the Swedish chemist Svante Arrhenius in 1889. The pre-exponential factor is also known as the frequency factor and represents the frequency of collisions between reactant molecules. Although often described as temperature-independent, it is actually dependent on temperature because it is related to molecular collision, which is a function of temperature. It can be determined by solving for A in the Arrhenius equation.
It's pretty much the likelihood of a molecular collision to occur. An H+ and H+ collision is way more likely to occur then an H H O since the molecules have to hit each other at a certain angle in order for the bonds to form.
To consolidate the important points of the other posts, the frequency factor is the frequency that molecules of the reactants collide with each other to react. This frequency is dependent on the temperature. We use it in conjunction with the rate constant, k, and the activation energy of the reaction, in the equation: k=Ae^(-Ea/RT).
Who is online
Users browsing this forum: No registered users and 1 guest