Question 1
Question detail
What is the difference between energy change and reaction rate in a reversible reaction?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
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Style
Topic
Reversible reactions and dynamic equilibrium
Question
What is the difference between energy change and reaction rate in a reversible reaction?
Answer
Energy change refers to the heat absorbed or released duringthe reaction, while reaction rate is the speed at which reactants are converted to products. In a reversible reaction, energy changes occur regardless of how quickly the reaction proceeds.
Explanation
This question tests the understandingof two distinct concepts in chemistry: energy changes and reaction rates. It assesses the student's ability to differentiate between these concepts in the context of reversible reactions.
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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