IB Chemistry SL 1.3.4 Biofuels Question Bank

Practise IB Chemistry SL 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: 1]

Gasoline (petrol), biodiesel and ethanol are fuels.

Table for Question 1.3.4—Biofuels question 1 — IB Chemistry SL

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.

Any one:

uses up fossil fuels more slowly

lower carbon footprint/ $\ce{CO2}$ 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

Marking guidance:

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

1 max

All question bank results loaded

1.3.4—Biofuels question 1