Chemistry Regents Practice Test 2025 – Complete Prep Resource

Question: 1 / 400

What characterizes a chemical equilibrium?

The system experiences no changes over time

The concentrations of reactants and products are unequal

The forward and reverse reactions occur at different rates

The concentrations of reactants and products remain constant over time

A chemical equilibrium is characterized by the condition whereby the concentrations of the reactants and products in a closed system remain constant over time. This does not mean that the reactants and products are equal in concentration; rather, it indicates that the rates of the forward and reverse reactions have become equal. As a result, though the individual molecules continue to react, the overall concentrations appear stable when measured over time.

In a dynamic equilibrium, the system is in continuous motion, with constant interconversion of reactants to products and vice versa, but no net change in concentration occurs. This consistent status is what distinguishes equilibrium from other states of a chemical reaction, where either the forward or reverse reaction is favored, leading to changes in the concentrations of reactants and products.

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