Question detail
What is the sign of the enthalpy change for an endothermic reaction (A-level cue d9354ec1 focus)
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Energetics
Question
- A. Positive
- B. Negative (A-level cue d9354ec1 distractor 1)
- C. Zero (A-level cue d9354ec1 distractor 2)
- D. Undefined (A-level cue d9354ec1 distractor 3)
Answer
Positive
Explanation
The correct option is Positive. Positive is correct because it supports the objective: Distinguish exothermic and endothermic reactions using enthalpy change signs.. The reasoning stays within Enthalpy change and avoids drifting into a similar A-Level Chemistry idea. This version is uniquely anchored to Enthalpy change. Retrieval anchor: A-level cue d9354ec1.
Common mistake
Confusing Exothermic and Endothermic Reactions
Students often confuse exothermic and endothermic reactions, thinking both release energy.
Exothermic reactions release energy to the surroundings, resulting in a negative enthalpy change (ΔH < 0), while endothermic reactions absorb energy, leading to a positive enthalpy change (ΔH > 0). To distinguish between them, remember that exothermic reactions feel hot (like combustion), whereas endothermic reactions feel cold (like photosynthesis).
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