DP Chemistry (last assessment 2024)

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Question 19N.3.sl.TZ0.c

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Date November 2019 Marks available [Maximum mark: 2] Reference code 19N.3.sl.TZ0.c
Level sl Paper 3 Time zone TZ0
Command term Explain Question number c Adapted from N/A
c.
[Maximum mark: 2]
19N.3.sl.TZ0.c

Ethanol is a biofuel that can be mixed with gasoline.

Explain, including a suitable equation, why biofuels are considered to be carbon neutral.

[2]

Markscheme

biofuel raw material/sugar/glucose formed by photosynthesis
OR
biofuel raw material/sugar/glucose uses up carbon dioxide during its formation
OR
biofuel from capturing gases due to decaying organic matter formed from photosynthesis ✔

6CO2 (g) + 6H2O (l) → C6H12O6 (aq) + 6O2 (g) ✔

NOTE: Accept arguments based on material coming from plant sources consuming carbon dioxide/carbon for M1.

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