tests for gases

Question 1

Oxygen (O₂)

Answer 1

• colourless, odorless gas
• relights a glowing splint

Question 2

Hydrogen (H₂)

Answer 2

• colourless, odorless gas
• squeaky pop

Question 3

Carbon dioxide (CO₂)

Answer 3

• colourless, odorless gas
• turns limewater milky white when bubbled through

Question 4

Ammonia (NH₃)

Answer 4

• colourless, pungent gas
• turns moist red litmus paper blue

Question 5

Chlorine (Cl₂)

Answer 5

• greenish yellow, pungent gas
• turns moist blue litmus paper red then bleaches