Question detail
Bond-breaking check. In Energy transfer during exothermic and endothermic reactions, a question asks what happens when reactant bonds break. Which conclusion best supports exothermic reaction?
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. Bond-breaking check: Energy must be supplied to break bonds in the reactants.
- B. Energy is always released when reactant bonds break.
- C. Bond breaking is the same as the products forming.
- D. Bond breaking decides voltage in a chemical cell.
Answer
The correct option is Bond-breaking check: Energy must be supplied to break bonds in the reactants..
Explanation
The correct option is Bond-breaking check: Energy must be supplied to break bonds in the reactants.. This scenario keeps the answer anchored to Energy transfer during exothermic and endothermic reactions in Exothermic and endothermic reactions. It supports exothermic reaction 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
Surroundings temperature change
Students think the temperature of the surroundings decreases during an exothermic reaction
Explain that in an exothermic reaction energy is released to the surroundings, so their temperature rises
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