Question detail
A student is revising The energy change of reactions (HT only). Which correction best fixes a mistake about HT only?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Exothermic and endothermic reactions
Question
- A. HT only: correct Unit 4.5 answer for The energy change of reactions (HT only)
- B. Incorrect correction: repeats the misconception without fixing the energy idea
- C. Incorrect correction: changes the topic to a different Chemistry unit
- D. Incorrect correction: ignores the named process in The energy change of reactions (HT only)
Answer
The correct option is HT only: correct Unit 4.5 answer for The energy change of reactions (HT only).
Explanation
The correct option is HT only: correct Unit 4.5 answer for The energy change of reactions (HT only). It directly supports the approved learning objective to (HT only) Include the correct sign or direction of energy transfer when interpreting a calculated energy change. This application version keeps the answer anchored to The energy change of reactions (HT only) within Exothermic and endothermic reactions, and avoids mixing energy transfer, reaction profiles, activation energy, chemical cells, fuel cells, exothermic reactions and endothermic reactions unless the objective names them.
Common mistake
Sign Interpretation Error
Students often forget to include the correct sign when interpreting energy changes, leading to incorrect conclusions about whether a reaction is exothermic or endothermic.
Always check if the energy change is positive or negative. A negative value indicates an exothermic reaction (energy released), while a positive value indicates an endothermic reaction (energy absorbed).
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