Chromatography
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Suggest the two factors that affect how far compounds travel up the chromatography paper
polarity size of molecule
Suggest why an 100% percentage yield cannot be obtained
the reaction is reversible
What is meant by the term closed system to do with equilibrium
when no reactants or products can escape
What test can be used to distinguish between an alkanal and a ketone
only the aldehyde can oxidise by tollens reagent to form a silver mirror
What does it mean when the atom economy is 100%
there are no waste products
in chromatography what is the time taken for the component to travel through the appartus called
retention time
In chromatography how can the identity of a component be identified
the distance it has travelled the time it has taken to travel through the apparatus
What is meant by retention factor
the distance travelled by the compound compared to the distance travelled by the solvent.
State how retention factors could be used
To help identify the components in a mixture
Suggests why there are only three spots in a chromatography
The spots for … overlap The Rf values are similar for …
Explain why different amino acids travel different distances up the chromatography paper
difference in the polarity or size of molecules results in different Rf for different compounds
What happens if too much solvent is added
the samples would dissolve in the solvent rather than travel up the paper with the solvent