Edexcel A-Level Chemistry A2 15.23 High Performance Liquid Chromatography Hplc and Gas Chromatography Gc Are Types of Column Chromatography That Separate Questions

Practise Edexcel IAL Chemistry HPLC and GC through retention times, chromatogram peaks, carrier gases, column phases and mass spectrometry links.

Exam points

Interpret HPLC or GC chromatograms using retention time, peak area and time-versus-absorption axes.
Explain separation by mobile and stationary phases, linking stronger column attraction to longer retention time.
Recognise carrier gases and GC/HPLC with mass spectrometry for drug testing, forensics or compound identification.

[Maximum number: 2]

High-performance liquid chromatography (HPLC) is used to separate a mixture into its three components.

The resulting chromatogram is shown.

Figure for Question Edexcel A-Level Chemistry A2 15.23 High Performance Liquid Chromatography Hplc and Gas Chromatography Gc Are Types of Column Chromatography That Separate Questions question 1 — Edexcel A-Level Chemistry A2

(a)

Which is correct for the labels on the axes?
□ A
□ B
□ C
□ D

Table for Question (a) — Edexcel A-Level Chemistry A2

[ 1 ]

The only correct answer is D (time, absorption)

A is incorrect because the labels are the wrong way round

B is incorrect because $R_{f}$ is not used in HPLC

C is incorrect because $R_{f}$ is not used in HPLC

(1)

(b)

Which is correct for the components E, F and G?

Figure for Question (b) — Edexcel A-Level Chemistry A2

E most attracted to stationary phase; E most abundant

G most attracted to stationary phase; E most abundant

E most attracted to stationary phase; F most abundant

G most attracted to stationary phase; F most abundant

[ 1 ]

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Edexcel A-Level Chemistry A2 15.23 High Performance Liquid Chromatography Hplc and Gas Chromatography Gc Are Types of Column Chromatography That Separate Questions question 1

Question (a)

Question (b)