This key facts covers Gas Collection Methods 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 10 of 13 in this topic. Use this key facts to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 10 of 13
Practice
20 questions
Recall
15 flashcards
📋 Gas Collection Methods
| Gas | Density vs Air | Solubility | Collection Method |
|---|---|---|---|
| H₂ | Less dense | Low | Downward delivery or over water |
| O₂ | Similar density | Low | Over water |
| CO₂ | Denser | Medium | Upward delivery |
| Cl₂ | Much denser | Medium | Upward delivery |
| NH₃ | Less dense | Very high | Downward delivery only |