IB Chemistry HL 1.3.4 Biofuels Question Bank

Practise IB Chemistry HL 1.3.4 by applying biofuels to exam-style questions.

Exam points

identify the relevant chemical structure, process or evidence
apply the correct chemical model or equation
evaluate the result using chemical reasoning and data

[Maximum number: 2]

Ethanol is a biofuel that can be mixed with gasoline.

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

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

$6 \mathrm{CO}_{2}(\mathrm{~g})+6 \mathrm{H}_{2} \mathrm{O}(\mathrm{l}) \rightarrow \mathrm{C}_{6} \mathrm{H}_{12} \mathrm{O}_{6}(\mathrm{aq})+6 \mathrm{O}_{2}(\mathrm{~g})$

Marking guidance:

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

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1.3.4—Biofuels question 1