to occur, then it may also be possible for the reverse reaction
A + B <-- C + D
to occur. Previously, while discussing Collision Theory, we learned that as a reaction progresses, the concentration of reactants decreases, and reaction rate decreases.
We can think of C and D as "reactants" for the reverse reaction. As the forward reaction "A+B–>C+D" progresses, the concentration of C and D increase, and the reverse reaction increases. A point is reached at which both reactions occur at the same rate, thus the concentrations of each species (A, B, C, and D) do not change.
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