DP Chemistry (first assessment 2025)

Question 19M.2.SL.TZ2.c

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

[Maximum mark: 2]

19M.2.SL.TZ2.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.

Syllabus sections

Structure 1. Models of the particulate nature of matter » Structure 1.5—Ideal gases » Structure 1.5.3—The molar volume of an ideal gas is a constant at a specific temperature and pressure. Investigate the relationship between temperature, pressure and volume for a fixed mass of an ideal gas and analyse graphs relating these variables.

Question 19M.2.SL.TZ2.c

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