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IB Chemistry HL 1.1.1 Energy Transfer Questions

Apply mark-scheme reasoning to explain how heat, sound, friction and incomplete combustion reduce useful energy below theoretical combustion values.

Syllabus
First assessment 2025
Course
Chemistry HL
Level
HL

Exam points

  • Explain why useful energy is lower than a theoretical combustion value by identifying transfers to the surroundings as heat, sound or friction, or incomplete combustion.

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Study 1.1.1—Energy transfer conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Chemistry HL 1.1.1 Energy Transfer Questions question 1

[Maximum number: 1]

The increased concentration of carbon dioxide in the atmosphere is thought to result from the increased combustion of fossil fuels such as petroleum.

Outline why the energy available from an engine will be less than these theoretical values.

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