Given the Rf of four spots in a normal phase paper chromatography, which of the following is the most polar? a.Rf= 0.21 b.Rf= 0.25 c.Rf= 0.40 d.Rf= 0.34

You run the chromatography system with paper as the stationary phase and 70% isopropanol as the mobile phase. You determine the Rf  of a polar analyte to be 0.40. If you use 100% isopropanol (a less polar solvent) instead of isopropanol as the mobile phase what would you expect to happen to the Rf  value? No value effect on Rf higher  lower could be higher or lower

True of false? 1. Raman Spectroscopy can be used in the airport to detect the presence of Alcohol in the bags? 2. Furnace atomisation is used when the concentration of the sample in the ppb level? 3. 24 karat of gold mean the percent of gold in the object is 75%?

thin layer chromatography: What would happen to the Rf value of a compound if you increased the polarity of the mobile phase while using a polar stationary phase?   please help me this question! Thank you a lot