8.2.1 Test for hydrogen
8.2.2 Test for oxygen
8.2.3 Test for carbon dioxide
8.2.4 Test for chlorine
| Gases | Test | Positive Result |
| Hydrogen (H2) | Burning spit held at the open end of a test tube of gas | Burns rapidly with a squeaky pop sound |
| Oxygen (O2) | Insert glowing splint into a test tube of gas | Relights |
| Carbon dioxide (CO2) | Bubble through limewater | Goes milky or cloudy |
| Chlorine (Cl2) | Damp (blue) litmus | (Goes red), then bleaches and turns white |
| Ammonia (NH3) | Damp red litmus | Turns blue |