Question detail
In a chemical reaction, if the actual yield is 20g and the theoretical yield is 50g, what is the percentage yield (A-level cue 963d64e4 focus)
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Mathematical requirements and assessment objectives
Question
- A. 40%
- B. 50% (A-level cue 963d64e4 distractor 1)
- C. 20% (A-level cue 963d64e4 distractor 2)
- D. 80% (A-level cue 963d64e4 distractor 3)
Answer
40%
Explanation
The correct option is 40%. 40% is correct because it supports the objective: Apply knowledge and understanding in theoretical, practical, qualitative and quantitative contexts.. The reasoning stays within Assessment objectives and paper structure and avoids drifting into a similar A-Level Chemistry idea. This version is uniquely anchored to Assessment objectives and paper structure. Retrieval anchor: A-level cue 963d64e4.
Common mistake
Misidentifying the role of the catalyst in a reaction
Students often think a catalyst is consumed during the reaction and therefore must be added in stoichiometric amounts.
Explain that a catalyst is not consumed; it only provides an alternative reaction pathway and is present in the same amount before and after the reaction. It should be added in catalytic (small) amounts and can be recovered and reused.
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