Gases

Question 1

Carbon Dioxide CO2

Answer 1

Carbon dioxide turns limewater milky. A lighted wooden splint goes out in a test tube of carbon dioxide but this happens with other gases, too. So the limewater test is a better choice.

Question 2

Hydrogen H2

Answer 2

A lighted wooden splint makes a popping sound in a test tube of hydrogen.

Question 3

Chlorine Cl2

Answer 3

Chlorine has a characteristic sharp, choking smell. It also makes damp blue litmus paper turn red, and then bleaches it white.

Question 4

Oxygen O2

Answer 4

A glowing wooden splint relights in a test tube of oxygen.

Question 5

Ammonia NH3

Answer 5

Ammonia has a characteristic sharp, choking smell. It also makes damp red litmus paper turn blue.