Why does changing concentration affect reaction rates?
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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.
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.
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