Combustion Products

IGCSE Edexcel Chemistry
4.11-4.16 Combustion and pollutants
Key Concept: Complete combustion produces carbon dioxide and water. Incomplete combustion produces carbon monoxide and soot.

Section A: Combustion

1. State the products of complete combustion of a hydrocarbon. [2]
2. What is produced in incomplete combustion and why is it dangerous? [2]

Section B: Pollution

3. Explain how nitrogen oxides are formed in car engines. [2]
4. Describe how sulfur dioxide contributes to acid rain. [2]

Total marks: 8

Mark Scheme

1. Carbon dioxide and water [2]
2. Carbon monoxide/soot; CO is toxic as it reduces oxygen transport in blood [2]
3. High temperatures cause N2 and O2 from air to react, forming NOx [2]
4. SO2 dissolves in rainwater to form acids; damages plants/buildings [2]