DP Chemistry (last assessment 2024)

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Question 19N.3.sl.TZ0.19

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Date November 2019 Marks available [Maximum mark: 2] Reference code 19N.3.sl.TZ0.19
Level sl Paper 3 Time zone TZ0
Command term Outline, Suggest Question number 19 Adapted from N/A
19.
[Maximum mark: 2]
19N.3.sl.TZ0.19

Disposal of chemical waste is a growing problem in industry.

(a)

Outline the impact of antibiotic waste on the environment.

[1]

Markscheme

«leads to bacterial» resistance «to antibiotics»
OR
destroys useful/beneficial bacteria
OR
useful/beneficial/less harmful bacteria replaced with «more» harmful bacteria ✔

NOTE: Accept "affects/disturbs micro-ecosystems".

(b)

Suggest a concern about the disposal of solvents from drug manufacturing.

[1]

Markscheme

Any one of:
«most are» toxic «to living organisms»
OR
incomplete combustion/incineration can produce toxic products/dioxins/phosgene
OR
carcinogenic/can cause cancer ✔

accumulate in groundwater
OR
have limited biodegradability ✔

cost of disposal ✔

NOTE: Do not accept “harmful to the environment”.
Do not accept just “pollutes water”.
Do not accept “hazard of disposal”.
Accept “ozone depletion” only if there is some reference to chlorinated solvents.

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