Question detail
Case 20 answer-sense. A student reviews the final answer. Which check best catches an exam error? Focus on why some product may lost when separated 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 20 answer-sense: Check that the answer size, unit, and chemical context all match for why some product may lost when separated
- B. Case 20 answer-sense: Accept the answer if it has many decimal places (Percentage yield)
- C. Case 20 answer-sense: Choose the answer with the biggest number because it looks more complete (why some product may lost when separated)
- D. Case 20 answer-sense: Drop the unit if the working contains a formula (Yield and atom economy of chemical reactions (chemistry only))
Answer
The correct option is Case 20 answer-sense: Check that the answer size, unit, and chemical context all match for why some product may lost when separated.
Explanation
The correct option is Case 20 answer-sense: Check that the answer size, unit, and chemical context all match for why some product may lost when separated. It supports the approved learning objective by keeping the method tied to why some product may lost when separated 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
Product Loss Explanation
Students often state that product loss occurs only due to incomplete reactions.
Emphasize that product loss can also happen during separation processes, such as filtration or evaporation, and not just from the reaction itself.
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