Which one of the following statements regarding a dynamic equilibrium is false?
At equilibrium, there is no net change in the system
At equilibrium, the concentration of reactants and products stays the same.
At equilibrium, the forward and back reactions cease to occur
At equilibrium, the rates of the forward and back reactions are identical
As we have learnt,
Characteristics of Chemical Equilibrium -
The following are the important characteristics of equilibrium:
-
At equilibrium, there is no net change in the system. It is tempting to think that this means nothing is happening at the level of the forward and back reactions - that is, that the forward and back reactions cease to occur. However, this is not true. Instead, the forward and back reactions happen at the same rates, so that they effectively cancel each other out - hence the reason that, to the observer, there is no observable change in the system.
Therefore, the option number(3) is correct.
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