What does equilibrium mean?
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Answer:
C)
Explanation:
In Chemistry, equilibrium means that in a system A + B ↔ C + D, both the reaction and the opposite reaction are happening at the same rate.
In the example, this would mean that C and D are being produced at the same rate that C and D convert into A and B. In other words, the concentration of both reactants and products remains constant.
Thus the answer is C.