Practice IB Chemistry Topic R1.3 Energy from Fuels with authentic exam-style questions for both SL and HL students. This question bank focuses on the exact syllabus content for R1.3 Energy from Fuels and mirrors Paper 1A, 1B, 2 style where relevant.

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Write the chemical equation for the complete combustion of a typical biofuel such as ethanol.

[1]

(d)

Explain why the combustion of biofuels is often described as “carbon-neutral”.

[2]

(e)

Suggest one reason why biofuels are not completely carbon-neutral in practice.

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A substance that reduces another in a chemical reaction

A substance that absorbs energy when burned

A substance that releases energy upon combustion

A substance that contains no carbon

I and II only

I and III only

II and III only

I, II and III

Combustion of hydrocarbons produces only carbon dioxide and water.

Complete combustion releases more energy than incomplete combustion.

Fossil fuels are renewable energy sources.

Combustion reactions are exothermic processes that absorb heat.

R1.1 Measuring enthalpy change

48 questions

R1.2 Energy cycles in reactions

28 questions

R1.3 Energy from fuels

56 questions

R1.4 Entropy and spontaneity (HL)

15 questions