Question detail
Hand-warmer evidence. In Reaction profiles, a student feels the pack get warmer. Which conclusion best supports reaction profile?
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 Reaction profiles in Exothermic and endothermic reactions. It supports reaction profile 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
Misinterpreting the reaction profile curve
Students think the curved line on a reaction profile represents the speed of the reaction rather than the change in energy as the reaction proceeds
Explain that the curved line shows the variation in potential energy of the system as reactants convert to products, not the reaction rate
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