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

There were a couple of comments claiming that this NOS question on “why to store hydrogen peroxide in brown bottles” is not the syllabus. Most candidates were quite capable of reasoning this out.

Syllabus sections