This memory aid covers Memory Aid within Greenhouse Effect for GCSE Chemistry. Revise Greenhouse Effect in Atmosphere for GCSE Chemistry with 20 exam-style questions and 12 flashcards. This topic appears less often, but it can still be a useful differentiator on mixed-topic papers. It is section 10 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 10 of 13
Practice
20 questions
Recall
12 flashcards
🧠 Memory Aid
A glass greenhouse TRAPS heat inside = greenhouse gases TRAP infrared radiation
For greenhouse gases: "CO₂, CH₄, H₂O — the 3 C's-M-W" (Carbon dioxide, Methane, Water)
For the mechanism: "Short-wave IN, long-wave trapped — like a one-way valve for heat"
Temperature without greenhouse effect: "-18°C = freezing death. With natural effect: +15°C = life. With enhanced effect: above +15°C = problem."
Quick Check: Explain why nitrogen is NOT a greenhouse gas even though it makes up 78% of the atmosphere.
Nitrogen (N₂) does not absorb infrared radiation because its symmetric molecular structure means it has no vibration modes that interact with IR radiation. Greenhouse gases must be able to absorb and re-emit infrared radiation — N₂ cannot do this.