DP Chemistry (first assessment 2025)

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Question 19M.2.SL.TZ1.a

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

Suggest why many chemicals, including hydrogen peroxide, are kept in brown bottles instead of clear colourless bottles.

[1]

Markscheme

decomposes in light  [✔]

 

Note: Accept “sensitive to light”.

Examiners report

The explanation that the brown bottle prevented light causing a decomposition of the chemical was well answered but some incorrectly suggested it helped to stop mixing up of chemicals e.g. acid/water/peroxide.

Syllabus sections