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The chromatography paper is spotted twice so as to increase the amount of sample used for the separation on the paper. This is to allow distinct banding of the sample into its constituents.
No, because the distance a compound moved in relation to the solvent front is relative. The higher up the solvent front the greater the distance travelled by the compound. Remembering that Rf is always <1.
You leave Crest White Strips on for 30 minutes for twice a day.
no
Yes.
Yes.
Depending on what colour the hair dye. Your hair will change colour twice
Yep
change or changes They change their clothes everyday. He changes his clothes twice a week.
he shot biggie twice
No, it is not.
Not directly, you'll have to change twice.