DP Chemistry (last assessment 2024)

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Question 19M.2.hl.TZ1.i

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Date May 2019 Marks available [Maximum mark: 1] Reference code 19M.2.hl.TZ1.i
Level hl Paper 2 Time zone TZ1
Command term Outline Question number i Adapted from N/A
i.
[Maximum mark: 1]
19M.2.hl.TZ1.i

This question is about sodium and its compounds.

Outline why a real gas differs from ideal behaviour at low temperature and high pressure.

[1]

Markscheme

Any one of:

finite volume of particles «requires adjustment to volume of gas»     [✔]

short-range attractive forces «overcomes low kinetic energy»    [✔]

Examiners report

Few candidates could distinguish the cause for difference in behaviour between real and ideal gases at low temperature or high pressure. Many answers were based on increase in number of collisions or faster rate or movement of gas particles.

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