AQA A-LEVEL CHEMISTRY A2 CHROMATOGRAPHY
QUESTIONS WITH RIGHT ANSWERS.
What,is,the,mobile,phase,in,chromatography?,,,ANS,-soluble,components,of,mixture,are,carried.
faster,it,moves,,the,more,soluble,it,is.
What,is,the,stationary,phase,in,chromatography?,,,ANS,-
components,of,mixture,held,back,which,are,attracted,to,it.
more,affinity,component,in,mixture,has,for,stationary,phase,,,the,slower,it,moves,with,the,solvent.
Describe,Thin-Layer,Chromatography,(TLC),,,ANS,-plastic,sheet,coated,with,silica,gel(,thin,layer).
acts,as,stationary,phase.
state,4,advantages,of,TLC,,,ANS,-runs,faster.
mixtures,of,small,amounts,can,be,separated.
spots,spread,out,less.
plates,are,more,robust,than,paper.
describe,two,ways,for,how,to,locate,the,position,of,colourless,spots.,,,ANS,-shining,uv,light,on,plate.
chemically,spraying,plate,with,locating,agent,which,reacts,with,components,in,mixture,to,give,coloured,c
ompounds.
Rf,value,,,ANS,-Distance,travelled,by,substance,/,distance,travelled,by,solvent
Explain,column,chromatography,,,ANS,-uses,powder,such,as,silica
acts,as,stationary,phase
packed,into,narrow,tube
eluent(solvent),is,added,at,top
fairly,large,amounts,can,be,separated
amino,acids,in,a,mixture
QUESTIONS WITH RIGHT ANSWERS.
What,is,the,mobile,phase,in,chromatography?,,,ANS,-soluble,components,of,mixture,are,carried.
faster,it,moves,,the,more,soluble,it,is.
What,is,the,stationary,phase,in,chromatography?,,,ANS,-
components,of,mixture,held,back,which,are,attracted,to,it.
more,affinity,component,in,mixture,has,for,stationary,phase,,,the,slower,it,moves,with,the,solvent.
Describe,Thin-Layer,Chromatography,(TLC),,,ANS,-plastic,sheet,coated,with,silica,gel(,thin,layer).
acts,as,stationary,phase.
state,4,advantages,of,TLC,,,ANS,-runs,faster.
mixtures,of,small,amounts,can,be,separated.
spots,spread,out,less.
plates,are,more,robust,than,paper.
describe,two,ways,for,how,to,locate,the,position,of,colourless,spots.,,,ANS,-shining,uv,light,on,plate.
chemically,spraying,plate,with,locating,agent,which,reacts,with,components,in,mixture,to,give,coloured,c
ompounds.
Rf,value,,,ANS,-Distance,travelled,by,substance,/,distance,travelled,by,solvent
Explain,column,chromatography,,,ANS,-uses,powder,such,as,silica
acts,as,stationary,phase
packed,into,narrow,tube
eluent(solvent),is,added,at,top
fairly,large,amounts,can,be,separated
amino,acids,in,a,mixture
