Welcome to the Quiz!
This quiz contains 10 questions from a mix of 1 subtopics.
What is the primary purpose of chromatography?
to create mixtures
to analyse pure substances
to separate mixtures
to combine mixtures
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Which of the following are the two key elements in chromatography?
liquid phase and gas phase
adsorbent and adsorbate
solvent and solute
mobile phase and stationary phase
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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 boiling point and melting point
differences in polarity and conductivity
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In thin-layer chromatography (TLC), what is typically used as the stationary phase?
silica
paper
glass
plastic
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How does the solvent move up the plate in TLC?
gravity
pressure
magnetism
capillary action
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What does the Rf value in TLC represent?
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
the distance travelled by the compound divided by the total length of the TLC plate
the ratio of the distance travelled by the solvent front to 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 cooled
it is dissolved
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?
retention times
colours
boiling points
melting points
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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 molecular weight of the substance
the boiling point of the substance
the purity of the substance
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