Question detail
In a closed system at equilibrium, what happens to the concentrations of reactants and products?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Reversible reactions and dynamic equilibrium
Question
- A. They increase indefinitely
- B. They decrease to zero
- C. They remain constant
- D. They fluctuate constantly
Answer
They remain constant
Explanation
The correct answer is They remain constant. This answer directly addresses the question: In a closed system at equilibrium, what happens to the concentrations of reactants and products? It matches the approved Chemistry 8462 learning objective and the linked subtopic. The other options are incorrect because they either change the rate, catalyst, reversible reaction, equilibrium, or graph context, or they do not answer the exact point being tested.
Common mistake
Closed vs Open System Confusion
Students often think that a closed system can exchange matter with its surroundings, so they believe equilibrium can be achieved in an open system as well.
Clarify that a closed system cannot exchange matter (only energy) with its surroundings; only in a closed system can a reversible reaction reach dynamic equilibrium because the amounts of reactants and products remain fixed. In an open system, continuous addition or removal of substances prevents the system from stabilising at constant concentrations, so true equilibrium cannot be achieved.
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