very-high Balancing equations (2-3 marks): Balance C first, then H, then O. Common for both complete and incomplete combustion.
high Compare combustion types (3 marks): Products, flame colour, oxygen supply, energy released, safety considerations.
high CO toxicity explanation (2 marks): Must mention "binds to haemoglobin", "prevents oxygen transport", and "colourless and odourless".
State symbols matter: CO₂(g), H₂O(l), C(s), CO(g). Including correct state symbols earns marks in 6-mark questions.
Edexcel 1CH0: Examined in Paper 2 (1CH0/2). Edexcel CP9 covers combustion of alcohols — questions on this practical test experimental design and data analysis. In Edexcel-style questions, the command word "Suggest" appears frequently — use your chemistry knowledge to apply to an unfamiliar context.
This exam focus covers Exam Focus: Combustion within Combustion for GCSE Chemistry. Revise Combustion in Organic Chemistry for GCSE Chemistry with 25 exam-style questions and 15 flashcards. Use this page as part of a wider topic revision path rather than treating it as an isolated fact. It is section 11 of 13 in this topic. Treat this as a marking guide for what examiners are looking for, not just a fact list.
Practice questions for Combustion
What are the only products formed during the complete combustion of a hydrocarbon?
Explain why carbon monoxide (CO) is toxic to humans. [3 marks]