Disposal of addition polymers
4 marks · NormalDescribe two reasons why poly(propene) is difficult to dispose of in the environment.
Explain one benefit of recycling poly(propene) instead of disposing of it in landfill.
Suggest one problem that might be caused by incinerating poly(propene).
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(a) It has strong covalent bonds and is non-biodegradable; it does not break down in the environment.
(b) Recycling reduces the amount of plastic in landfill and conserves resources.
(c) Incineration produces carbon dioxide or other pollutants.
Also accept: a) Strong covalent bonds; not broken down by bacteria/non-biodegradable; b) Saves raw materials/reduces landfill waste; c) Releases CO2 or toxic gases
Common mistakes: Suggesting poly(propene) decomposes easily; Not mentioning recycling as an advantage; Saying incineration 'destroys' plastic as a benefit
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Marking points
B1 (a) · 1 mark · Gives one reason: strong covalent bonds/inertness.
B2 (a) · 1 mark · Gives second reason: non-biodegradable/ not broken down by bacteria.
B3 (b) · 1 mark · Explains a benefit of recycling (e.g., saves resources/reduces landfill).
B4 (c) · 1 mark · States a problem of incineration (e.g., CO2 released; pollution).
Worked solution
a) Poly(propene) is hard to dispose of because it does not decompose, as it is non-biodegradable and made of very stable molecules.
b) Recycling poly(propene) conserves raw materials and reduces waste going to landfill.
c) Burning poly(propene) releases carbon dioxide, which contributes to climate change, or may release other harmful gases.