This comparison covers All Gas Tests: Quick Reference within Gas Tests for GCSE Chemistry. Revise Gas Tests in Chemical Analysis for GCSE Chemistry with 20 exam-style questions and 15 flashcards. This is a high-frequency topic, so it is worth revising until the explanation feels precise and repeatable. It is section 6 of 13 in this topic. Use this comparison to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 6 of 13
Practice
20 questions
Recall
15 flashcards
⚖️ All Gas Tests: Quick Reference
| Gas | Test Method | Positive Result | Equation |
|---|---|---|---|
| H₂ | Burning splint | Squeaky pop sound | 2H₂ + O₂ → 2H₂O |
| O₂ | Glowing splint | Splint relights | Supports combustion |
| CO₂ | Limewater | Turns milky/cloudy | CO₂ + Ca(OH)₂ → CaCO₃ + H₂O |
| Cl₂ | Damp blue litmus | Bleached white | Cl₂ + H₂O → HClO + HCl |
| NH₃ | Damp red litmus OR HCl rod | Turns blue OR white fumes | NH₃ + HCl → NH₄Cl |