Welcome to the Quiz!
This quiz contains 11 questions from a mix of 1 subtopics.
What is the primary purpose of chromatography?
to separate mixtures
to combine mixtures
to create mixtures
to analyse pure substances
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Which of the following are the two key elements in chromatography?
mobile phase and stationary phase
solvent and solute
liquid phase and gas phase
adsorbent and adsorbate
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What causes components in a mixture to separate during chromatography?
differences in polarity and conductivity
differences in solubility and adsorption
differences in boiling point and melting point
differences in density and viscosity
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In thin-layer chromatography (TLC), what is typically used as the stationary phase?
paper
glass
silica
plastic
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How does the solvent move up the plate in TLC?
magnetism
gravity
capillary action
pressure
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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 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
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What carries the mixture components through the column in column chromatography?
a solvent
electricity
magnetism
a gas
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In gas chromatography (GC), what happens to the liquid sample before it enters the chromatographic column?
it is vaporised
it is condensed
it is cooled
it is dissolved
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What carries the vaporised sample through the chromatographic column in gas chromatography?
electricity
a liquid solvent
an inert gas
a vacuum
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What is used to identify substances in gas chromatography?
boiling points
melting points
retention times
colours
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Explain how GC-MS is used to separate and identify componenets in complex mixtures.
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