Question detail
For The energy change of reactions (HT only), which answer best supports this AQA GCSE Chemistry Unit 4.5 objective: (HT only) State that energy must be supplied to break bonds in reactants?
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: confuses HT only with a nearby Energy changes idea
- C. Incorrect: gives a general chemistry statement without linking to The energy change of reactions (HT only)
- D. Incorrect: reverses the energy-change relationship in Exothermic and endothermic reactions
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 must be supplied to break bonds in reactants. This 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
Confusion about Bond Breaking
Students often state that energy is released when bonds in reactants are broken, rather than recognizing that energy must be supplied to break these bonds.
Remember that breaking bonds requires energy input, while forming bonds releases energy. Focus on the distinction between these processes.
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