Question detail
Case 71 exam-language. Which response would earn credit for the calculation method? Focus on why yield may reduced reactants take part in Percentage yield, not on a neighbouring Unit 4.3 idea.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Yield and atom economy of chemical reactions (chemistry only)
Question
- A. Case 71 exam-language: Show formula, substitution, calculation, final answer, and unit for why yield may reduced reactants take part
- B. Case 71 exam-language: Write only the final answer with no working (Percentage yield)
- C. Case 71 exam-language: Describe the practical method instead of the calculation relationship (why yield may reduced reactants take part)
- D. Case 71 exam-language: Quote the topic title without applying it to the data (Yield and atom economy of chemical reactions (chemistry only))
Answer
The correct option is Case 71 exam-language: Show formula, substitution, calculation, final answer, and unit for why yield may reduced reactants take part.
Explanation
The correct option is Case 71 exam-language: Show formula, substitution, calculation, final answer, and unit for why yield may reduced reactants take part. It supports the approved learning objective by keeping the method tied to why yield may reduced reactants take part in Percentage yield. The other options are incorrect because they either use the wrong quantitative relationship, lose the required unit, confuse coefficients with subscripts, or report an answer without a complete worked method.
Common mistake
Misunderstanding Unexpected Reactions
Students often think that unexpected reactions only reduce the yield of the desired product without considering that they can also produce unwanted by-products.
To fix this, students should remember that unexpected reactions can divert reactants away from forming the desired product, leading to both a lower yield of the desired product and the formation of by-products. Keep the correction anchored to Percentage yield; check formula, substitution, calculation, final answer, and unit where relevant.
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