Question detail
For Percentage yield, which unit conversion answer best supports this Unit 4.3 objective: (chemistry only) Use ratios, fractions and percentages in yield calculations. (MS 1c)?
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. 80%
- B. Wrong unit conversion: confuses chemistry only with a nearby Unit 4.3 idea
- C. Wrong unit check: uses the wrong unit for Percentage yield
- D. Wrong calculation link: does not support (chemistry only) Use ratios, fractions and percentages in yield calculations. (MS 1c)
Answer
The correct option is 80%. The calculated answer is 80 %.
Explanation
The correct option is 80%. This uses Percentage Yield because the objective is about (chemistry only) Use ratios, fractions and percentages in yield calculations. (MS 1c). This unit conversion variant asks students to separate chemistry only from similar Unit 4.3 calculation steps. The reasoning belongs to Percentage yield within Yield and atom economy of chemical reactions (chemistry only), so it should not be confused with nearby quantitative ideas such as mass, moles, concentration, yield, atom economy, or gas volume unless those are named in the objective. Use the focus term chemistry only to keep the answer aligned with AQA GCSE Chemistry 8462 Unit 4.3. The other options are weaker because they either use the wrong formula, the wrong unit, a vague relationship, or the wrong quantitative context.
Common mistake
Confusing Actual and Theoretical Yield
Students often confuse actual yield with theoretical yield when calculating percentage yield.
Always identify the actual yield (what was obtained) and the theoretical yield (maximum possible) separately before performing the calculation.
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