Paper ____ is used to separate mixtures of ____ substances. These are often ____ substances such as ____ colourings, inks, dyes or plant ____. Chromatography relies on two different ____. The ____ phase, which in paper chromatography is ____ paper and the mobile phase, which is the ____ that moves through the stationary phase carrying different ____ with it, often water or ethanol. The different ____ substances in a mixture are ____ to the two phases by different ammounts. This causes them to ____ at different ____ through the ____. A paper ____ can be used to distinguish between ____ and impure substances. A pure ____ produces ____ spot on the chromatogram. An ____ substance produces two or more spots A chromatogram can also be used to ____ substances by ____ them with known substances.Two ____ are likely to be the same if they produce the same ____ of spots that match in ____ and if the spots travel the same ____ up the paper. Rf ____ can be used to identify ____ chemicals if they can be compared to a range of ____ substances. The Rf value is always the ____ for a particular substance if run in the same solvent system in the same ____. The Rf value is ____ by dividing the distance the solute travelled by the distance the ____ travelled. Rf values ____ from 0 (the substance is not ____ at all to the mobile ____ to 1 (the ____ is not attracted to the ____ phase). Different ____ have different Rf ____ in different solvents, which can be used to ____ them. The compounds in a ____ may separate into ____ spots depending on the solvent, but a pure compound produces a ____ spot in all solvents.

Chromatography Summary Sentences

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