Question detail
In chromatography, what does the Rf value represent?
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. The distance traveled by the compound divided by the distance traveled by the solvent front.
- B. The distance traveled by the solvent front.
- C. The total time taken for the separation process.
- D. The concentration of the compound in the mixture.
Answer
The distance traveled by the compound divided by the distance traveled by the solvent front.
Explanation
The correct option is The distance traveled by the compound divided by the distance traveled by the solvent front.. The distance traveled by the compound divided by the distance traveled by the solvent front. is the best answer because it directly supports the AQA A-Level Chemistry objective to use chromatography evidence with spectroscopic data in analysis. This reasoning is anchored to Chromatography (A-level only) in Chromatography (A-level only), and it separates chromatography from similar A-Level ideas rather than relying on a vague recall statement. Other options are weaker if they use the wrong evidence, calculation, mechanism, observation, unit, or conclusion for this subtopic.
Common mistake
Misunderstanding Chromatography Evidence
Students often confuse the roles of stationary and mobile phases in chromatography, leading to incorrect conclusions about separation.
To fix this, students should clearly define the stationary phase as the substance that remains fixed in place and the mobile phase as the solvent that moves through it, ensuring they understand how each contributes to the separation process.
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