Memory Aid: Clean and Dirty Combustion
Part of Combustion · GCSE GCSE Chemistry revision
This memory aid covers Memory Aid: Clean and Dirty 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 9 of 13 in this topic. Use it for quick recall, then test yourself straight afterwards so the memory aid becomes usable in an answer.
Topic position
Section 9 of 13
Practice
25 questions
Recall
15 flashcards
🧠 Memory Aid: Clean and Dirty Combustion
Remember using the two types of Bunsen burner flame:
- Blue flame (air hole open) = Complete combustion → CO₂ + H₂O (CLEAN)
- Yellow flame (air hole closed) = Incomplete combustion → CO + C (DIRTY)
Also remember: Complete = CO₂ + H₂O (clean, safe), Incomplete = CO + C + H₂O (dirty, dangerous).
For balancing complete combustion equations, use the rule: Balance C first, then H, then O last (oxygens always come last because you can adjust O₂ freely).
Keep building this topic
Read this section alongside the surrounding pages in Combustion. That gives you the full topic sequence instead of a single isolated revision point.
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]
Quick Recall Flashcards
25 questions on Combustion — practise free
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