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Date November 2018 Marks available 2 Reference code 18N.3.hl.TZ0.23
Level HL Paper 3 Time zone TZ0
Command term Outline Question number 23 Adapted from N/A

Question

Scientists have developed various analytical techniques.

State an analytical technique used to separate anabolic steroids from other compounds in an athlete’s urine or blood.

[1]
a.

Ethanol in breath can be detected by a redox reaction. Outline this method of detection. An equation is not required.

[2]
b.

Markscheme

gas chromatography/GC

OR

high performance liquid chromatography/HPLC ✔ 

 

Accept “chromatography”, “TLC/thin-layer chromatography”, “paper chromatography” OR “extraction”.

Do not accept just “mass spectrometry/MS” but do not penalize any reference to MS with HPLC or GC (eg GC-MS).

a.

ALTERNATIVE 1:

Any two of:

«blow through tube of» acidified «orange» potassium dichromate(VI)/K2Cr2O7/dichromate/Cr2O72–

Cr(VI)/Cr6+/Cr2O72– reduced to Cr(III)/Cr3+

 

colour changes «from orange» to green

OR

colour change is monitored ✔

 

ALTERNATIVE 2:

oxygen reduced to water

OR

ethanol oxidized to ethanoic/acetic acid ✔

 

current measured ✔

 

Accept “ethanol oxidized to ethanal/acetaldehyde”.

b.

Examiners report

[N/A]
a.
[N/A]
b.

Syllabus sections

Options » D: Medicinal chemistry » D.9 Drug detection and analysis (HL only)
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