DP Chemistry (first assessment 2025)

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Question 20N.1B.SL.TZ0.b

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Date November 2020 Marks available [Maximum mark: 1] Reference code 20N.1B.SL.TZ0.b
Level SL Paper 1B Time zone TZ0
Command term State Question number b Adapted from N/A
b.
[Maximum mark: 1]
20N.1B.SL.TZ0.b

State one reason why the mixture was not heated strongly.

[1]

Markscheme

solvent/oil is flammable
OR
solvent/oil must be kept below its flash point
OR
oxidation/decomposition of oil
OR
mixture has a low boiling point ✔

Accept “to prevent evaporation of oil”.

Examiners report

Another correctly answered question. As accepted by notes many candidates scored by stating "to prevent evaporation of oil". This resulted in the same argument scoring twice as often used for 1d as well. Some students incorrectly indicated the problem was to prevent the evaporation of the solvent which was the point of this step in the experiment. This could indicate a general lack of understanding of experimental methods.

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