DP Chemistry (first assessment 2025)

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Question 19M.2.SL.TZ2.2c

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Date May 2019 Marks available [Maximum mark: 2] Reference code 19M.2.SL.TZ2.2c
Level SL Paper 2 Time zone TZ2
Command term Sketch Question number c Adapted from N/A
c.
[Maximum mark: 2]
19M.2.SL.TZ2.2c
(c)

The experiment is repeated using the same amount of dinitrogen monoxide in the same apparatus, but at a lower temperature.

Sketch, on the axes in question 2, the graph that you would expect.

[2]

Markscheme

smaller initial gradient  [✔]

initial pressure is lower AND final pressure of gas lower «by similar factor»  [✔]

 

Examiners report

This was a challenging question. Candidates usually obtained only one of the two marks allocated for the answer. Most of them scored the mark for a lower initial slope at low temperature, while others scored a mark for sketching their curve below the original curve as all pressures (initial and final) will be lower at the lower temperature. A teacher commented that the wording was unclear “sketch on the axes in question 2”, and it would have been better to label the graph instead.

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