Consider the reaction below.

[tex]2 N_2 O_5(g) \longleftrightarrow 4 NO_2(g)+O_2(g)[/tex]

If the reaction is at dynamic equilibrium at 500 K, which statement applies to the given chemical system?

A. The rates of the forward and reverse reactions are unequal.
B. The concentrations of the products and reactants do not change.
C. The forward reaction stops at 500 K.

At dynamic equilibrium, the rates of the forward and reverse reactions are equal.
The concentrations of the products and reactants remain constant.
The forward and reverse reactions continue to occur.
Therefore, the correct statement is: The concentrations of the products and reactants do not change. T h eco n ce n t r a t i o n so f t h e p ro d u c t s an d re a c t an t s d o n o t c han g e . ​

Explanation

Equal Rates At dynamic equilibrium, the rates of the forward and reverse reactions are equal. This means that the rate at which reactants are converting into products is the same as the rate at which products are converting back into reactants.

Constant Concentrations The concentrations of the products and reactants do not change at dynamic equilibrium. While individual molecules are constantly reacting, the overall amounts of each substance remain constant.

Continuous Reactions The forward and reverse reactions continue to occur at dynamic equilibrium. The reaction does not stop; instead, it proceeds in both directions at equal rates, maintaining a steady state.

Conclusion Based on the above analysis, the correct statement is: The concentrations of the products and reactants do not change.


Examples
Dynamic equilibrium is similar to a balanced tug-of-war. Both teams are pulling with equal force, so the rope doesn't move, even though both teams are actively pulling. In chemistry, this means the forward and reverse reactions are happening at the same rate, keeping the concentrations of reactants and products constant. This concept is crucial in many real-world applications, such as controlling the yield of chemical reactions in industrial processes or understanding how the body maintains homeostasis.

Answered by GinnyAnswer | 2025-07-03

At dynamic equilibrium, the rates of the forward and reverse reactions are equal, meaning that concentrations of products and reactants remain constant. Thus, the correct answer is option B: The concentrations of the products and reactants do not change. The forward and reverse reactions continue to occur without stopping, maintaining a steady state in the system.
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Answered by Anonymous | 2025-07-04