DP Chemistry (last assessment 2024)

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Question 20N.2.sl.TZ0.4d(iii)

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Date November 2020 Marks available [Maximum mark: 2] Reference code 20N.2.sl.TZ0.4d(iii)
Level sl Paper 2 Time zone TZ0
Command term Describe Question number d(iii) Adapted from N/A
d(iii).
[Maximum mark: 2]
20N.2.sl.TZ0.4d(iii)

Nickel catalyses the conversion of propanone to propan-2-ol.

(d(iii))

Describe the bonding in metals.

[2]

Markscheme

electrostatic attraction ✔

between «a lattice of» metal/positive ions/cations AND «a sea of» delocalized electrons ✔


Accept “mobile/free electrons”.

Examiners report

The mean mark on the question was 1.0 out of 2 marks. Mistakes included not mentioning the 'electrostatic attraction' and talking about 'nuclei attracting the delocalised electrons'. The weakest candidates discussed aspects of ionic and/or covalent bonding.

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