Why does changing concentration affect reaction rates?

Question

taramgrant0543664 · Answer

The position of equilibrium is changed if you change the concentration of something present in the mixture. According to Le Chatelier's Principle, the position of equilibrium moves in such a way as to tend to undo the change that you have made.

Suppose you have an equilibrium established between four substances A, B, C and D.

A+2B -->C+D

According to Le Chatelier's Principle, if you decrease the concentration of C, for example, the position of equilibrium will move to the right to increase the concentration again.

cuanchi · Answer

The question is about Reaction Rates and concentration, not about equilibrium @taramgrant053664. @sibby The reaction rates some times are dependent of the concentration and sometimes NOT. Depends of the order of the reaction. A reaction of zero order, the rate of the reaction is independent of changes in the concentration of the reactants Rate= k [A]^0 Rate=−d[A]/dt=k[A]0=k=constant http://chemwiki.ucdavis.edu/Physical_Chemistry/Kinetics/Reaction_Rates/Zero-Order_Reactions