1. In paper chromatography what is the mobile phase?

a) The solvent
b) The chromatography paper
c) The baseline
d) The ink samples

2. What is the stationary phase in paper chromatography?

a) The solvent
b) The chromatography paper

3. In paper chromatography why is a pencil line used instead of a pen line for the baseline?

a) Pencil lines are more visible
b) Pencil lines are less likely to react with the samples
c) Pencil lines are easier to draw
d) Pen ink would dissolve in the solvent and affect the results

4. What is the R_f value in chromatography?

a) The distance the solvent travels/the distance the substance travels
b) The distance the substance travels/ the distance the solvent travels
c) The distance the solvent travels + the distance the substance travels
d) The distance the substance travels - the distance the solvent travels

5. If a substance has a high R_f value this would indicate it is highly in the solvent and that it spends more time in the phase than the stationary phase.

6. What happens to the R_f value for a substance if the solvent is changed from water to ethanol?

a) It remains unchanged
b) It increases
c) It decreases
d) It would change

7. If two substances have the same R_f value under the same conditions then the two substances are likely to be the substance.

8. The two factors that determine how far a substance travels up the chromatography paper are the of the substance in the solvent and its attraction to the paper, or we could say the amount of time it spends in the stationary phase.

9. Why is the chromatography tank covered with a lid?

a) To prevent the solvent from evaporating
b) To keep the chromatography paper flat
c) To keep the chromatography paper clean and free from contamination
d) To keep the tank in the dark

10. The presence of multiple dots for a sample on a chromatogram would indicate that the substance is a .

11. In paper chromatography what is the baseline?

a) The top of the chromatography paper
b) The bottom of the chromatography paper
c) The point on the chromatography paper where the solvent starts moving from
d) The pencil line where the sample is spotted onto the chromatography paper

12. Approximately how far up the chromatography paper should the solvent be allowed to rise before the paper is removed and dried?

a) 25%
b) 50%
c) 75%
d) 100%