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IB Chemistry SL 1.3 Energy From Fuels Questions

Practise IB Chemistry SL 1.3 with questions that balance combustion equations, compare fuel impacts and explain how fuel cells convert chemical energy into electricity.

Syllabus
First assessment 2025
Course
Chemistry SL
Level
SL

Exam points

  • Balance complete and incomplete combustion equations for hydrocarbons and alcohols, identifying carbon monoxide and soot products.
  • Compare fossil and biofuels using carbon dioxide output, energy yield and renewable carbon-cycle evidence.
  • Write fuel-cell half-equations and relate chemical energy conversion to electrical output.

Covered syllabus points

1.3.1—Combustion reactions1.3.2—Incomplete combustion1.3.3—Fossil fuels1.3.4—Biofuels1.3.5—Fuel cells

Learn this topic

Study 1.3 Energy from fuels conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

Question 1

[Maximum number: 1]

Ethyne, C2H2\mathrm{C}_{2} \mathrm{H}_{2}, reacts with oxygen in welding torches.

Write an equation for the complete combustion of ethyne.

Question 2

[Maximum number: 1]

Which products may be formed during incomplete combustion of octane?

A

CO2\mathrm{CO}_{2} and H2\mathrm{H}_{2}

B

CO and H2\mathrm{H}_{2}

C

CO and H2O\mathrm{H}_{2} \mathrm{O}

D

C, CO and H2\mathrm{H}_{2}

Question 3

[Maximum number: 1]

The chart shows how sunlight changes as it passes through the earth's atmosphere. The light grey area shows the intensity at different wavelengths of sunlight entering the atmosphere. The dark grey area shows how much reaches sea level. Various molecules which interact with sunlight and the wavelengths they absorb are indicated on the following chart.

Spectrum of solar radiation (Earth)

Spectrum of solar radiation (Earth)

Identify a major greenhouse gas not given in the diagram.

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