Question detail
In a reversible reaction where the forward reaction is endothermic and absorbs 40 kJ, what is the energy change for the reverse reaction?
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. 40 kJ
- B. 80 kJ
- C. 20 kJ
- D. 0 kJ
Answer
40 kJ
Explanation
The correct answer is 40 kJ. This answer directly addresses the question: In a reversible reaction where the forward reaction is endothermic and absorbs 40 kJ, what is the energy change for the reverse reaction? 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
Confusing Exothermic and Endothermic
Students often confuse which direction of a reversible reaction is exothermic and which is endothermic.
To fix this, remember that if the forward reaction releases energy (exothermic), the reverse reaction must absorb energy (endothermic), and vice versa.
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