Thin Layer Chromatography and Gas Chromatography in this course both separate compounds based on polarity. (GC separates compounds by boiling point only if the oolarity of the compounds are the same.) Select the true statements about TLC and GC. TLC and GC can quantitate purity of a sample you can compare Rf values to provided standards but not retention times for given chemicals polar compounds come off slower in TLC and faster in GC the sample analyzed is solid for TLC and liquid for GC the stationary phase is polar for TLC and nonpolar for GC \% composition can be calculated for a chemical mixture analyzed with GC but not with TLC the mobile phase is liquid for TLC and gas for GC