DP Chemistry (first assessment 2025)

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Question 23M.2.SL.TZ2.21a

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Date May 2023 Marks available [Maximum mark: 1] Reference code 23M.2.SL.TZ2.21a
Level SL Paper 2 Time zone TZ2
Command term State Question number a Adapted from N/A
a.
[Maximum mark: 1]
23M.2.SL.TZ2.21a
(a)

State one problem associated with chlorinated organic solvents as chemical waste.

[1]

Markscheme

Any one of:

«most are» toxic «to living organisms»
OR
incomplete combustion/incineration can produce toxic products/dioxins/phosgene
OR
carcinogenic ✓

«some can be» greenhouse gases ✓

ozone-depleting ✓

can contribute to formation of «photochemical» smog ✓

accumulate in groundwater
OR
have limited biodegradability ✓

cost/hazards of disposal ✓

 

Do not accept “harmful to the environment”.

Do not accept just “pollutes water”.

Do not accept “increases acid rain/acidity/acid deposition”.