Question detail
Case 01 answer-sense. A student reviews the final answer. Which check best catches an exam error? Focus on atom economy for reaction form desired product in Atom economy, 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 01 answer-sense: Check that the answer size, unit, and chemical context all match for atom economy for reaction form desired product
- B. Case 01 answer-sense: Accept the answer if it has many decimal places (Atom economy)
- C. Case 01 answer-sense: Choose the answer with the biggest number because it looks more complete (atom economy for reaction form desired product)
- D. Case 01 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 01 answer-sense: Check that the answer size, unit, and chemical context all match for atom economy for reaction form desired product.
Explanation
The correct option is Case 01 answer-sense: Check that the answer size, unit, and chemical context all match for atom economy for reaction form desired product. It supports the approved learning objective by keeping the method tied to atom economy for reaction form desired product in Atom economy. 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
Confusing Atom Economy with Percentage Yield
Students often confuse atom economy with percentage yield, thinking they are the same concept.
Remember that atom economy measures the efficiency of a reaction in terms of starting materials converted to useful products, while percentage yield compares the actual product obtained to the theoretical maximum. Keep the correction anchored to Atom economy; check formula, substitution, calculation, final answer, and unit where relevant.
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