Question detail
Which statement would earn credit for Explain why Rf values are only useful for comparison under the same conditions.?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Purity, formulations and chromatography
Question
- A. Different temperatures affect the solvent's movement
- B. Different solvents can change the distance moved
- C. Variations in paper thickness can alter results
- D. All of the above
Answer
The correct answer is All of the above. It matches chromatography because the evidence is spot and solvent-front distances and the expected result is Rf or separation evidence.
Explanation
The correct option is All of the above. The answer stays inside Purity, formulations and chromatography by linking the observation to the conclusion instead of naming a substance without evidence. Other options are weaker when they confuse gas tests, flame colours, ion-test precipitates, chromatography evidence, or pure-substance/formulation wording.
Common mistake
Understanding Rf Values
Students often think Rf values can be compared across different experiments without considering the conditions.
Emphasize that Rf values are only meaningful when the chromatography is performed under the same conditions, such as temperature and solvent.
Related flashcards
Flashcard 1 of 5
Related practice questions
Question 1 of 5
Choose an answer, get feedback, then move sideways through the set.