Unit 4: Reactivity 1: What Drives Chemical Reactions?
Topic 4.3: Energy from Fuels Questions
Practice 8 exam-style questions for IB Chemistry Topic 4.3. Review the question stems below, then unlock the full Question Bank to access markschemes, model answers, and AI grading.
1state2 marks
Write a balanced equation for the complete combustion of methane and state the two products.
Markscheme and model answer locked
Unlock Question2explain3 marks
Explain why incomplete combustion of a hydrocarbon is dangerous, naming the product responsible.
Markscheme and model answer locked
Unlock Question3define3 marks
Define enthalpy of combustion and explain why its value is always negative.
Markscheme and model answer locked
Unlock Question4compare3 marks
Compare a fossil fuel with a biofuel in terms of carbon dioxide released, and explain why a biofuel is sometimes described as carbon neutral.
Markscheme and model answer locked
Unlock Question5Outline2 marks
Outline two advantages of using ethanol made from sugar cane, rather than gasoline, as a vehicle fuel. [2]
Markscheme and model answer locked
Unlock Question6Explain3 marks
A hydrocarbon is burned in a limited supply of oxygen.
State the type of combustion, name the two carbon-containing products that may form, and explain why less energy is released than in complete combustion. [3]
State the type of combustion, name the two carbon-containing products that may form, and explain why less energy is released than in complete combustion. [3]
Markscheme and model answer locked
Unlock Question7Identify1 mark
2026
Which product of incomplete combustion is a toxic gas that binds to haemoglobin?
Markscheme and model answer locked
Unlock Question8Explain1 mark
2026
Explain why incomplete combustion of a hydrocarbon releases less energy than complete combustion.
Markscheme and model answer locked
Unlock QuestionReady to practice Topic 4.3?
Get instant AI feedback on your answers, view detailed markschemes, and track your progress across all IB Chemistry topics.