DP Chemistry (last assessment 2024)

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Question 18M.3.sl.TZ1.7c.iv

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Date May 2018 Marks available [Maximum mark: 1] Reference code 18M.3.sl.TZ1.7c.iv
Level sl Paper 3 Time zone TZ1
Command term Outline Question number c.iv Adapted from N/A
c.iv.
[Maximum mark: 1]
18M.3.sl.TZ1.7c.iv

Saturated lipids found in butter and unsaturated lipids found in fish oil readily become rancid.

(c.iv)

Plastics are another source of marine pollution. Outline one way in which plastics can be made more biodegradable.

[1]

Markscheme

add starch/cellulose/carbohydrates/additives/catalysts «to plastic during manufacture to allow digestion by micro-organisms»

OR

replace traditional plastics with polylactic acid/PLA-based ones

OR

blend traditional and polylactic acid/PLA-based plastics

 

Accept reference to biodegradable plastics other than PLA; for example polyhydroxyalkanoates (PHA), poly(butylene succinate) (PBS), polybutylene adipate terephthalate (PBAT) and polycaprolactone (PCL).

[1 mark]

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