DP Chemistry (first assessment 2025)

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Question 23M.2.HL.TZ1.21a

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Date May 2023 Marks available [Maximum mark: 3] Reference code 23M.2.HL.TZ1.21a
Level HL Paper 2 Time zone TZ1
Command term Explain, State Question number a Adapted from N/A
a.
[Maximum mark: 3]
23M.2.HL.TZ1.21a
(a)

An example of a steroid is testosterone.

(a.i)

State the technique used to separate steroids, such as testosterone, from biological fluids.

[1]

Markscheme

chromatography ✓

Once separation has been completed, the components can be identified using mass spectrometry. The following mass spectrum is of testosterone:

[Source: SDBS, National Institute of Advanced Industrial Science and Technology.]

(a.ii)

Explain how the fragments at m/z 288 and 273 can be used to show that it is testosterone, C19H28O2, Mr 288.

 

m/z 288:

 

 


m/z 273:

 

 

 

[2]

Markscheme

m/z 288:
molecular ion/M+/C19H28O2 + ✓

m/z 273:
C18H25O2 +
OR
loss of methyl/CH3 group" or "(M − CH3)+ ✓