Question detail
Hand-warmer evidence. In Energy transfer during exothermic and endothermic reactions, a student feels the pack get warmer. Which conclusion best supports calculation?
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. Hand-warmer evidence: Energy is transferred to the surroundings, so the temperature rises.
- B. Energy is taken from the surroundings, so the pack must be endothermic.
- C. Activation energy is the same as the total energy transferred.
- D. The observation proves the reaction is a fuel cell.
Answer
The correct option is Hand-warmer evidence: Energy is transferred to the surroundings, so the temperature rises..
Explanation
The correct option is Hand-warmer evidence: Energy is transferred to the surroundings, so the temperature rises.. This scenario keeps the answer anchored to Energy transfer during exothermic and endothermic reactions in Exothermic and endothermic reactions. It supports calculation without repeating the same wording as nearby Energy changes questions, and it separates exothermic, endothermic, activation-energy, bond-energy, cell and fuel-cell ideas.
Common mistake
Misunderstanding Enthalpy Change
Students often think that calculating enthalpy change (ΔH) is necessary for all reactions in this section.
Remember that for this GCSE section, it is explicitly stated that the calculation of enthalpy change is not required.
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