Question detail
Which example applies HT only accurately within Exothermic and endothermic reactions?
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 example: uses a device, reaction, or diagram not linked to HT only
- C. Incorrect example: gives evidence without explaining the energy transfer
- D. Incorrect example: describes a broad practical skill instead of the objective
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) State that energy is released when bonds in products are formed. This diagram 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
Misidentifying bond formation energy
Students often think that forming bonds always requires energy input, so they write that energy is absorbed when bonds in products are formed.
Explain that bond formation releases energy; the energy released is the negative of the bond energy and should be subtracted when calculating the overall energy change.
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