DP Chemistry (last assessment 2024)

Test builder »

Question 22N.2.hl.TZ0.3c

Select a Test
Date November 2022 Marks available [Maximum mark: 1] Reference code 22N.2.hl.TZ0.3c
Level hl Paper 2 Time zone TZ0
Command term Justify, Predict Question number c Adapted from N/A
c.
[Maximum mark: 1]
22N.2.hl.TZ0.3c

Consider the following reaction:

Cu2+ (aq) + Fe (s) → Fe2+ (aq) + Cu (s)

(c)

Predict, with a reason, whether Cu or Cu2+ has the greater ionization energy.

[1]

Markscheme

Cu2+ AND fewer shielding electrons/less electron-electron repulsion «from same nuclear charge»

OR

Cu2+ AND larger effective nuclear charge

OR

Cu2+ AND more energy required to remove electron from positive ion than neutral parent atom

OR

Cu2+ AND smaller radius

OR

Cu2+ AND electron is being lost from a lower energy/inner/3d orbital ✔

Examiners report

Whilst a few students considered the ionisation energy of copper atom to be greater than that of Cu2+, the majority of students, who instinctively realised the subsequent ionisation energies of an atom would be greater than the first, found it difficult to construct a clear argument to support this, hence the average mark was only 0.6.

Syllabus sections