DP Chemistry (last assessment 2024)

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Question 18M.3.hl.TZ1.5c

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Date May 2018 Marks available [Maximum mark: 2] Reference code 18M.3.hl.TZ1.5c
Level hl Paper 3 Time zone TZ1
Command term Determine Question number c Adapted from N/A
c.
[Maximum mark: 2]
18M.3.hl.TZ1.5c

Aluminium is produced by the electrolysis of a molten electrolyte containing bauxite.

(c)

When X-rays of wavelength 0.154 nm are directed at a crystal of aluminium, the first order diffraction pattern is observed at 18°. Determine the separation of layers of aluminium atoms in the crystal, in m, using section 1 of the data booklet.

[2]

Markscheme

«nλ = 2d sin θ»

1 × 1.54 × 10–10 = 2 × d × sin 18

d « 1.54 × 10 − 10  m 2 × 0.309 » = 2.49 × 10–10 «m»

 

Award [2] for correct final answer.

[2 marks]

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