Chemical Tests for Gases
IGCSE Edexcel Chemistry
2.44 Tests for common gases
Key Concept:
Different gases are identified by characteristic tests using splints or damp litmus.
Section A: Gas Tests
1. State the test and positive result for hydrogen gas.
[2]
2. State the test and positive result for oxygen gas.
[2]
3. State the test and positive result for carbon dioxide.
[2]
4. State the test and positive result for ammonia.
[2]
5. State the test and positive result for chlorine gas.
[2]
Total marks: 10
Mark Scheme
1.
Lighted splint gives a squeaky pop [2]
2.
Glowing splint relights [2]
3.
Bubble through limewater; turns milky [2]
4.
Damp red litmus turns blue [2]
5.
Damp blue litmus turns red then bleached white [2]