Memory Aid: Clean and Dirty Combustion
Part of Combustion — GCSE Chemistry
This memory aid covers Memory Aid: Clean and Dirty 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 9 of 12 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 12
Practice
20 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).