Question detail
A beaker becomes warmer during a reaction. Which statement best identifies the reaction type?
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. It is exothermic because energy is transferred to the surroundings.
- B. It is endothermic because energy is stored in the products.
- C. It is exothermic because bonds never need energy to break.
- D. It is endothermic because the surroundings gain energy.
Answer
It is exothermic because energy is transferred to the surroundings. That is why the beaker or solution becomes warmer during the reaction.
Explanation
It is exothermic because the reaction releases energy into the surroundings. The rise in temperature is the evidence students should connect to the definition of an exothermic reaction, not to colour change or mass change.
Common mistake
Misunderstanding Exothermic Reactions
Students often think that exothermic reactions absorb energy from the surroundings instead of transferring it.
Remember that an exothermic reaction is defined as one that transfers energy to the surroundings, resulting in a release of heat.
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