Respuesta :
4)when the rates of the forward and reverse reactions are equal
The system which describes chemicals being a in a dynamic equilibrium means that they are both in equal reaction with one another. This means that those those rates of reaction both forward and reverse are equally interacting.
The correct answer is 4. The dynamic equilibrium is a chemical equilibrium, in which two reversible reactions occur at the same speed, in both directions, maintaining the concentration of reactants and products constant over time. In other words, in dynamic equilibrium two opposite reactions occur at the same speed in the opposite direction.