9 posts • Page 1 of 1
Thermodynamics is focused on the transfer of heat or energy in a reaction, focusing primarily on the beginning and ends of the state of a reaction while kinetics is focused on the actual speed of the process taken to get to that reaction.
So if a product forms when the temperature is high, it is controlled by thermodynamics; if another product forms when the temperature is low, it is controlled by kinetics since it has a relatively low activation ennergy.
Saying a reaction is either kinetically or thermodynamically controlled means that the kinetic or thermodynamic factors of the reaction are ultimately determining if and how the reaction is going to take place. In this case, it can be helpful to look at what each term means. Thermodynamics looks at the interrelation of heat and work within chemical reactions while kinetics is focused on the speed at which a reaction takes place. So if a reaction takes place because of high temperatures, for example, you can infer that it is thermodynamically controlled while if a reaction takes place in cold temperatures very quickly, you could infer that since temperature is not a factor but the speed of the reaction is, that reaction is kinetically controlled.
Who is online
Users browsing this forum: No registered users and 1 guest