Question detail

What is the significance of Le Chatelier's Principle in reversible reactions?

Try the question, check the answer, then read the explanation to understand the curriculum point.

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At a glance

MCQ

Type

practice

Style

Topic

Reversible reactions and dynamic equilibrium

Question

A. It states that reactions can only go forward
B. It predicts how changes in conditions affect equilibrium
C. It defines the rate of reaction
D. It explains why reactions stop

Answer

It predicts how changes in conditions affect equilibrium

Explanation

The correct answer is It predicts how changes in conditions affect equilibrium. This answer directly addresses the question: What is the significance of Le Chatelier's Principle in reversible reactions? 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

Mixing up energy change with reaction rate

Students often think that the direction of heat flow (exothermic or endothermic) tells them how fast the reaction proceeds, confusing energy change with the rate of the forward and reverse reactions.

Explain that energy change refers to the heat absorbed or released when bonds are broken or formed, while the reaction rate is the speed at which the forward and reverse reactions occur. Use the example of hydrated copper(II) sulfate: the forward reaction (CuSO₄·5H₂O → CuSO₄ + 5H₂O) is endothermic, but the rate at which water is removed depends on temperature and concentration, not on the heat of the reaction itself.

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