Question detail
In the quartz written-response scenario for Chromatography, explain how Rf value supports this objective: Calculate Rf values using distance moved by substance divided by distance moved by solvent..
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Purity, formulations and chromatography
Question
In the quartz written-response scenario for Chromatography, explain how Rf value supports this objective: Calculate Rf values using distance moved by substance divided by distance moved by solvent..
Answer
A high-scoring answer should explain calculate Rf values using distance moved by substance divided by distance moved by solvent. Use evidence before identification: name the relevant test or measurement, state the observation, and then connect the result to Chromatography.
Explanation
The important distinction is that chromatography must be identified from spot and solvent-front distances; answers that swap in a different test or result do not match Chromatography. A complete answer should use the approved objective wording, include the relevant evidence, and avoid unsupported identification claims.
Common mistake
Misunderstanding Rf Value Calculation
Students often confuse the distances moved by the substance and the solvent when calculating Rf values.
Ensure to measure the distance moved by the substance and the distance moved by the solvent separately, then use the formula Rf = distance moved by substance / distance moved by solvent.
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