DP Chemistry (first assessment 2025)

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Question 19M.1B.SL.TZ1.1a

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Date May 2019 Marks available [Maximum mark: 2] Reference code 19M.1B.SL.TZ1.1a
Level SL Paper 1B Time zone TZ1
Command term Deduce Question number a Adapted from N/A
a.
[Maximum mark: 2]
19M.1B.SL.TZ1.1a
(a)

Deduce, giving a reason, the group of elements in the periodic table most likely to undergo sublimation.

[2]

Markscheme

group 18/noble gases  [✔]

smallest difference between melting and boiling points
OR
weakest intermolecular forces «in that period»  [✔]

 

Note: Accept “group 17/halogens”.

Examiners report

Some candidates appeared to be unfamiliar with the term “sublimation”. Whilst most students correctly identified the noble gases as the group most likely to sublime there were a variety of other answers. Many students referred to “low melting and boiling points” rather than identifying the difference between these as the key factor.