DP Chemistry (last assessment 2024)

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Question 20N.2.hl.TZ0.c

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Date November 2020 Marks available [Maximum mark: 3] Reference code 20N.2.hl.TZ0.c
Level hl Paper 2 Time zone TZ0
Command term Discuss Question number c Adapted from N/A
c.
[Maximum mark: 3]
20N.2.hl.TZ0.c

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

Discuss, referring to intermolecular forces present, the relative volatility of propanone and propan-2-ol.

[3]

Markscheme

hydrogen bonding/bonds «and dipole–dipole and London/dispersion forces are present in» propan-2-ol ✔

dipole–dipole «and London/dispersion are present in» propanone ✔

propan-2-ol less volatile AND hydrogen bonding/bonds stronger «than dipole–dipole »
OR
propan-2-ol less volatile AND «sum of all» intermolecular forces stronger ✔

Examiners report

The average mark was 1.9/3. Almost all candidates could recognize hydrogen bonding in alcohol but many missed the dipole-dipole attraction in propanone. There was also some confusion on the term volatility, with some thinking stronger IMF meant higher volatility.

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