Question detail
Rf data check ALC-105cce61: Which answer best handles spot-distance divided by solvent-front distance in this A-Level Chemistry chromatography scenario?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Chromatography (A-level only)
Question
- A. Rf data check ALC-105cce61: use spot-distance divided by solvent-front distance, then link the evidence to Rf calculation with a precise conclusion.
- B. Rf data check ALC-105cce61: state a memorised definition without applying the evidence.
- C. Rf data check ALC-105cce61: make a conclusion before identifying the measured relationship.
- D. Rf data check ALC-105cce61: describe an unrelated analytical method instead of the chromatogram.
Answer
Rf data check ALC-105cce61: use spot-distance divided by solvent-front distance, then link the evidence to Rf calculation with a precise conclusion.
Explanation
Rf data check ALC-105cce61: use spot-distance divided by solvent-front distance, then link the evidence to Rf calculation with a precise conclusion. The correct response is evidence-led and avoids generic recall.
Common mistake
Incorrect Rf Value Calculation
Students often forget to measure the distance travelled by the substance from the baseline when calculating the Rf value.
Always measure the distance from the baseline to the centre of the spot for the substance and divide it by the distance travelled by the solvent front.
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