DP Chemistry (last assessment 2024)

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Question 18M.3.hl.TZ1.13a

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Date May 2018 Marks available [Maximum mark: 2] Reference code 18M.3.hl.TZ1.13a
Level hl Paper 3 Time zone TZ1
Command term Outline Question number a Adapted from N/A
a.
[Maximum mark: 2]
18M.3.hl.TZ1.13a

One suggestion for the reduction of carbon footprints is the use of biofuels, such as vegetable oils, as a substitute for petroleum based fuels.

(a)

Outline the major technical problem affecting the direct use of vegetable oils as fuels in internal combustion engines and the chemical conversion that has overcome this.

[2]

Markscheme

viscosity «of vegetable oils is too high»

 

transesterification

OR

«conversion into» alkyl/methyl/ethyl esters

 

[2 marks]

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