DP Chemistry (last assessment 2024)

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Question 19N.3.sl.TZ0.a

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Date November 2019 Marks available [Maximum mark: 1] Reference code 19N.3.sl.TZ0.a
Level sl Paper 3 Time zone TZ0
Command term Suggest Question number a Adapted from N/A
a.
[Maximum mark: 1]
19N.3.sl.TZ0.a

Octane number is a measure of the performance of engine fuel.

Suggest why a high-octane number fuel is preferable.

[1]

Markscheme

low knocking/auto-ignition
NOTE: Do not accept “pre-ignition”.
OR
more efficient fuel
NOTE: Accept “less CO2 emissions since knocking engine uses more fuel «to produce the same power»”.
OR
high compression
OR
more power extracted
OR
more air going into engine / turbocharging
OR
less engine damage ✔

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