Question detail
Chromatography practice ALC-6ca86af8: Which answer best handles fixed-phase and moving-phase interpretation 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. Chromatography practice ALC-6ca86af8: use fixed-phase and moving-phase interpretation, then link the evidence to chromatography evidence with a precise conclusion.
- B. Chromatography practice ALC-6ca86af8: state a memorised definition without applying the evidence.
- C. Chromatography practice ALC-6ca86af8: make a conclusion before identifying the measured relationship.
- D. Chromatography practice ALC-6ca86af8: describe an unrelated analytical method instead of the chromatogram.
Answer
Chromatography practice ALC-6ca86af8: use fixed-phase and moving-phase interpretation, then link the evidence to chromatography evidence with a precise conclusion.
Explanation
Chromatography practice ALC-6ca86af8: use fixed-phase and moving-phase interpretation, then link the evidence to chromatography evidence 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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