DP Chemistry (last assessment 2024)

Question 20N.2.hl.TZ0.6a

Date	November 2020	Marks available	[Maximum mark: 2]	Reference code	20N.2.hl.TZ0.6a
Level	hl	Paper	2	Time zone	TZ0
Command term	Determine	Question number	a	Adapted from	N/A

[Maximum mark: 2]

20N.2.hl.TZ0.6a

(a)

The electron configuration of copper makes it a useful metal.

Determine the frequency of a photon that will cause the first ionization of copper. Use sections 1, 2 and 8 of the data booklet.

[2]

Markscheme

$« E = \frac{745 000 J {mol}^{- 1}}{6.02 \times 10^{23} {mol}^{- 1}} = » 1.24 \times 10^{- 18} J$ ✔

$« E = h ν »$
$« 1.24 \times 10^{- 18} J = 6.63 \times 10^{- 34} J s \times ν »$
$ν = 1.87 \times 10^{15} « s^{- 1} / Hz »$ ✔

Award [2] for correct final answer.
Award [1] for 1.12 × 10³⁹ «Hz».

Examiners report

Determining the frequency of a photon that will cause the first ionization of copper was the most challenging question on the exam. Many could not do it all, although some came up with the answer that came from using the result that would arise from the ionization energy in J/mole (and frequently kJ/mole) rather than J/atom.

Syllabus sections

Additional higher level (AHL)

Additional higher level (AHL) » Topic 12: Atomic structure » 12.1 Electrons in atoms

Additional higher level (AHL) » Topic 12: Atomic structure

Question 20N.2.hl.TZ0.6a

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