DP Chemistry (first assessment 2025)

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Question 20N.2.SL.TZ0.9d

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Date November 2020 Marks available [Maximum mark: 1] Reference code 20N.2.SL.TZ0.9d
Level SL Paper 2 Time zone TZ0
Command term Suggest Question number d Adapted from N/A
d.
[Maximum mark: 1]
20N.2.SL.TZ0.9d
(d)

A mixture of gasoline and ethanol is often used as a fuel. Suggest an advantage of such a mixture over the use of pure gasoline. Exclude any discussion of cost.

 

[1]

Markscheme

Any one:

uses up fossil fuels more slowly ✔

lower carbon footprint/CO2 emissions ✔

undergoes more complete combustion ✔

produces fewer particulates ✔

higher octane number/rating
OR
less knocking ✔

prevents fuel injection system build up
OR
helps keep engine clean ✔


Accept an example of a suitable advantage even if repeated from 9c.

Examiners report

Another question where many candidates obtained the mark. In quite a few cases students repeated the argument for (c) and this allowed them to get two points for the same answer.

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