Chemistry - NMR AND CHROMATOGRAPHY

what is the trace showing the area under each peak of an NMR spectrum called

the integration trace

which 2 atoms can be examined by NMR

¹³C or ¹H

what does TMS stand for

tetramethylsilane

what does a triplet splitting pattern tell us

adjacent CH2 group

what does TLC stand for

thin layer chromatography

which rule can be used to interpret spin-spin splitting patterns

the n+1 rule

which 2 ways can samples be identified in chromatography

retention times or Rf values

is a solvent the mobile or stationary phase in chromatography

mobile phase

name 3 types of chromatography

thin layer
column
gas

how many adjacent protons would give a 1:3:3:1 splitting pattern in ¹H NMR

3

what does a quartet splitting pattern in ¹H NMR tell us

adjacent CH3 group

what does NMR stand for

nuclear magnetic resonance

why is TMS used as a reference in NMR spectroscopy

all its protons and carbon atoms are in the same environment so it gives a single , strong signal
its signal is away from all the others
it is inert

how can rf values be calculated

distance moved by spot/distance moved by solvent front

what does an integration trace show

the number of protons in that particular environment

in a ¹³C NMR spectrum, what do the peaks represent

the number of different carbon environments around the carbon atom that causes the peak

what determines how far a sample will travel in chromatography

affinity of the compound for the mobile and stationary phases

why is TLC better than paper chromatography

runs faster
smaller amounts of mixtures can be separated
plates more robust than paper

what is the advantage of column chromatography

fairly large amounts of mixture can be separated and collected

what is GCMS

gas chromatography - mass spectrometry
retention time and mass measured

will a non polar molecule move fast or slow in a non polar solvent (mobile phase)

fast

will a polar molecule move fast or slow in a polar solvent

fast

how can atoms be in the same environment

if they are joined to exactly the same groups