🎨 Chromatography
Master paper chromatography as a separation technique! This quiz focuses on understanding how components in mixtures separate based on their solubility differences. You'll learn about the roles of mobile and stationary phases, interpret $R_f$ values, and identify plant pigments and ink components using chromatographic methods. **What you'll learn:** - How paper chromatography separates mixtures based on solubility - The function of mobile and stationary phases - Calculate and interpret $R_f$ values - Identify pigments in plant leaves - Apply chromatography to real-world samples like inks
Questions in this quiz
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- Question 1
In paper chromatography, what is the primary role of the mobile phase?
- Question 2
Which statement best describes the stationary phase in paper chromatography?
- Question 3
Paper chromatography can separate components in a mixture because different substances have different solubilities in the mobile phase.
- Question 4
If a plant pigment travels 6 cm up the paper and the solvent front travels 10 cm, what is the value for that pigment?
- Question 5
In a chromatography experiment, which pigment is most soluble in the mobile phase if three pigments have values of 0.25, 0.55, and 0.80?
- Question 6
Green leaf pigment (chlorophyll) can be separated into multiple components using paper chromatography because it is actually a mixture of different pigments.
- Question 7
Why is it important that the initial sample line in paper chromatography is placed near the bottom of the paper strip?
- Question 8
Which of the following would be the best choice for a mobile phase when separating black ink using paper chromatography?
- Question 9
In paper chromatography of plant pigments, if the solvent front reaches the top of the paper, what should you do to prevent losing separation data?
- Question 10
Two different inks with identical visual color will always produce identical chromatography patterns because they contain the same pigments.
- Question 11
A chromatography experiment produces a pigment with an value of 0.95. What does this tell you about the pigment's interaction with the stationary phase?
- Question 12
In paper chromatography, what determines whether a component will have a high or low value?
- Question 13
The value of a specific pigment remains constant regardless of which solvent is used as the mobile phase in the chromatography experiment.
- Question 14
If you perform a paper chromatography separation and observe that all pigment spots travel approximately the same distance, which of the following is the most likely explanation?
- Question 15
Why is paper chromatography classified as a separation technique based on differences in solubility rather than on differences in size or mass?
- Question 16
When comparing two plant leaf samples using paper chromatography, sample A shows 4 distinct pigment bands and sample B shows only 2 bands. Which conclusion is most reasonable?