the retention factor, or rf, is a number that describes the position of a spot on a chromatography plate relative to the position of the solvent on the chromatography plate. what are the minimum and maximum values of rf?

Drug abuse will not lead to physical and psychological dependence. true or false ?

In the space, show a correct numerical setup for calculating the number of moles of co2 present in 11 grams of co2

Asample of hydrated tin (ii) chloride (sncl2) has a mass of 4.90 g. when it is dehydrated, it has a mass of 4.10 g. which is the correct chemical formula for the hydrate? sncl2•2h2o          sncl2•4h2o          sncl2•6h2o