Lesson 4.8.1.3
4.8.1.3 Chromatography Quiz: AQA Chemistry, Unit 8
20 questions
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Lesson 4.8.1.3, Chromatography: 20 multiple choice questions for the AQA GCSE Chemistry (8462), Unit 8: Chemical analysis, written with Revision Ninja.
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The 20 questions
-
What are the two phases in chromatography?
- Stationary and mobile
- Liquid and metal
- Acid and base
- Solid and gas
-
What determines how well substances separate during chromatography?
- Melting point
- Atomic weight
- Phase distribution
- Flame colour
-
What is the numerator in the calculation for an Rf value in chromatography?
- Distance moved by solvent
- Diameter of the spot
- Distance moved by substance
- Height of origin line
-
Which part of a chromatographic spot is measured from the origin for an Rf value?
- The bottom edge
- The centre
- The outer ring
- The top edge
-
What does a pure compound produce on a chromatogram using any solvent?
- No spots
- Two spots
- A smudged line
- A single spot
-
What is the usual range of Rf values?
- 0 to 1
- 1 to 10
- 0 to 100
- -1 to 0
-
Why might a mixture show different spot patterns in different solvents?
- Faster evaporation
- Higher temperature
- Larger paper
- Different distribution
-
Which method is used to separate mixtures of coloured compounds?
- Simple distillation
- Fractional distillation
- Crystallisation
- Paper chromatography
-
A substance travels 6 cm and the solvent travels 12 cm. What is its Rf value?
- 0.25
- 6
- 2
- 0.5
-
A spot is 3.5 cm from the origin and the solvent front is 7.0 cm. What is Rf to 2 significant figures?
- 0.50
- 2.0
- 0.5 cm
- 0.35
-
Rf is 0.80 and the solvent moves 10 cm. How far did the spot move?
- 0.8 cm
- 8 cm
- 10.8 cm
- 12.5 cm
-
Which Rf value indicates a spot that moved further up the paper?
- 0.30
- 0.70
- 0.15
- 0.03
-
An unknown sample matches a standard Rf value in one solvent. What can be deduced?
- It is definitely identical
- It is a pure element
- It is a mixture
- It may be identical
-
A sample gives three spots in one solvent. What type of substance is it?
- A mixture
- A pure compound
- A standard
- A pure element
-
Which two lengths are needed to calculate an Rf value?
- Paper and solvent
- Origin and solvent
- Spot and origin
- Spot and solvent
-
Why is the baseline drawn in pencil rather than ink for chromatography?
- Pencil is insoluble
- Pencil is darker
- Ink reacts chemically
- Ink dissolves
-
What does a changing Rf value in different solvents demonstrate?
- Constant distribution
- Impure substances
- Incorrect measurements
- Different solubilities
-
What does the Rf value represent in chromatography calculations?
- Solvent front
- Percentage
- Ratio
- Total distance
-
What key calculation is practised in required practical paper chromatography?
- Rf values
- Percentage yield
- Concentration
- Atom economy
-
What is the stationary phase usually made of in paper chromatography?
- Plastic sheet
- Glass slide
- Filter paper
- Metal plate
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