DP Chemistry (first assessment 2025)

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Question 23M.2.HL.TZ2.5a

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Date May 2023 Marks available [Maximum mark: 4] Reference code 23M.2.HL.TZ2.5a
Level HL Paper 2 Time zone TZ2
Command term Explain, Identify, State Question number a Adapted from N/A
a.
[Maximum mark: 4]
23M.2.HL.TZ2.5a
(a)

The unit cell of lead (II) sulfide is shown:

(a.i)

State the coordination number of the lead (II) ion.

[1]

Markscheme

6 ✓

(a.ii)

There are 14 sulfide ions shown in the diagram. Explain why the unit cell is only considered to contain 4 sulfide ions.

[2]

Markscheme

6 on faces «shared between two unit cells» so 6x½ = 3 ✓

8 on corners «shared between eight unit cells» so 8x⅛ = 1 ✓

(a.iii)

Identify one technique that could be used to determine the structure of lead (II) sulfide.

[1]

Markscheme

X-ray crystallography/diffraction ✓

 

Accept “electron/neutron diffraction”.