DP Chemistry (last assessment 2024)

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Question 18M.3.sl.TZ2.14b

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Date May 2018 Marks available [Maximum mark: 1] Reference code 18M.3.sl.TZ2.14b
Level sl Paper 3 Time zone TZ2
Command term Outline Question number b Adapted from N/A
b.
[Maximum mark: 1]
18M.3.sl.TZ2.14b

One method of producing biodiesel is by a transesterification process.

(b)

Outline why the ester product of this reaction is a better diesel fuel than pentyl octanoate.

[1]

Markscheme

less viscous «and so does not need to be heated to flow»

OR

less likely to undergo incomplete combustion

OR

fewer intermolecular/London/dispersion forces

OR

vaporizes easier

 

Ignore equation and products in 14a.

Accept “van der Waals’/vdW” for “London”.

[1 mark]

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