DP Chemistry (last assessment 2024)

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Question 18N.3.sl.TZ0.16

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Date November 2018 Marks available [Maximum mark: 2] Reference code 18N.3.sl.TZ0.16
Level sl Paper 3 Time zone TZ0
Command term Suggest Question number 16 Adapted from N/A
16.
[Maximum mark: 2]
18N.3.sl.TZ0.16

Suggest two reasons why chlorinated solvents should neither be released into the atmosphere nor incinerated (burnt).

[2]

Markscheme

Any two of:

«weak» C–Cl bonds break/produce radicals ✔

contribute to ozone depletion ✔

contribute to «photochemical» smog ✔

cause cancers ✔

damage respiratory system ✔

cause organ failure ✔

produce toxic chemicals/phosgene/dioxins ✔

 

Accept “chlorinated solvents are toxic”.

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