[问答题]
The diagram shows the
erk6*ab ,n 4 ,u)ulfqjwla htoby5 hu1k(tr55z5a e9/ separation of photosynthetic pigments using the thin-layer chromatography (TLC) technique in
e 55k/at51 (oryuhh5bzaw9 l tthe solvent propanone.
1.Identify a pigment that is present in cabbage but not in spinach
2.Outline the method used to extract the pigments from the plant leaves.
3.1Outline what information the Rf value provides in this experiment.
2.Calculate the Rf value of Xanthophyll, showing your working.
4.Spinach also contains Lycopene, an orange/red pigment. Suggest why it is absent from the chromatogram.
5.Deduce, with a reason, what pigment X is.
6.Explain why the origin must be above the solvent at the start of the experiment.
7.Explain why it is important that the TLC plate is held by its edges when setting up this experiment.
