Welcome to the Quiz!
This quiz contains 10 questions from a mix of 1 subtopics.
What is the primary purpose of chromatography?
to analyse pure substances
to combine mixtures
to separate mixtures
to create mixtures
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Which of the following are the two key elements in chromatography?
liquid phase and gas phase
mobile phase and stationary phase
solvent and solute
adsorbent and adsorbate
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What causes components in a mixture to separate during chromatography?
differences in solubility and adsorption
differences in density and viscosity
differences in polarity and conductivity
differences in boiling point and melting point
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In thin-layer chromatography (TLC), what is typically used as the stationary phase?
plastic
glass
paper
silica
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How does the solvent move up the plate in TLC?
magnetism
pressure
capillary action
gravity
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What does the Rf value in TLC represent?
the ratio of the distance travelled by the solvent front to the distance travelled by the compound
the distance travelled by the compound divided by the total length of the TLC plate
the ratio of the distance travelled by the compound to the distance travelled by the solvent front
the distance travelled by the solvent divided by the distance travelled by the compound
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In gas chromatography (GC), what happens to the liquid sample before it enters the chromatographic column?
it is condensed
it is dissolved
it is cooled
it is vaporised
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What carries the vaporised sample through the chromatographic column in gas chromatography?
a liquid solvent
an inert gas
electricity
a vacuum
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What is used to identify substances in gas chromatography?
melting points
retention times
boiling points
colours
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In a gas chromatogram, what does the area under each peak indicate?
the percentage composition of the substance in the sample
the purity of the substance
the boiling point of the substance
the molecular weight of the substance
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