When a system is at equilibrium, the concentrations of the reactants and the products must be

Regents Chemistry Exam August 2025 Question 20

20 When a system is at equilibrium, the concentrations of the reactants and the products must be

(1) equal (3) decreasing (2) constant (4) increasing

Solution:

There are two things we have to know about systems at equilibrium. First, the rate of forward reaction has to be equal to the rate of reverse reaction. Second, the concentrations of reactants and products have to stay constant. Choice 2 is the correct answer.

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