This exam focus covers Exam Focus: Combustion within Combustion for GCSE Chemistry. Revise Combustion in Organic Chemistry for GCSE Chemistry with 20 exam-style questions and 15 flashcards. This topic appears regularly enough that it should still be part of a steady revision cycle. It is section 10 of 12 in this topic. Treat this as a marking guide for what examiners are looking for, not just a fact list.
Topic position
Section 10 of 12
Practice
20 questions
Recall
15 flashcards
🎯 Exam Focus: Combustion
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.