Question detail
Case 18 formula-choice. A student starts a worked solution. Which first step is most appropriate? Focus on why reaction pathway chosen data such atom 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 18 formula-choice: Use the named relationship before substituting numbers for why reaction pathway chosen data such atom
- B. Case 18 formula-choice: Start with a memorised answer and add a unit later (Atom economy)
- C. Case 18 formula-choice: Change every number into a percentage before choosing a formula (why reaction pathway chosen data such atom)
- D. Case 18 formula-choice: Use a nearby formula from a different quantitative chemistry subtopic (Yield and atom economy of chemical reactions (chemistry only))
Answer
The correct option is Case 18 formula-choice: Use the named relationship before substituting numbers for why reaction pathway chosen data such atom.
Explanation
The correct option is Case 18 formula-choice: Use the named relationship before substituting numbers for why reaction pathway chosen data such atom. It supports the approved learning objective by keeping the method tied to why reaction pathway chosen data such atom 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 Yield
Students often confuse atom economy with percentage yield, thinking they are the same concept.
To fix this, remember that atom economy measures the efficiency of a reaction in terms of how much of the starting materials become 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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