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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-combustion equations for hydrocarbons, alcohols and other organic compounds.
  • Predict CO and carbon formation when oxygen is limited, then balance incomplete-combustion equations.
  • Compare fuels by CO₂ released per unit energy and calculate specific energy from combustion data.
  • Explain how CO₂ and methane absorb infrared radiation and evaluate greenhouse-effect evidence.
  • Evaluate biofuels against fossil fuels using carbon fixation, land use and energy trade-offs.
  • Write hydrogen fuel-cell half-equations and identify chemical-to-electrical energy conversion.

Covered syllabus points

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

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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