Tests For Gases

Question 1

Test for oxygen

Answer 1

If oxygen is present in a test tube, a glowing splint will relight when held inside

Question 2

Test for hydrogen

Answer 2

If hydrogen is present in a test tube, a lighted splint held near its mouth ignites with a squeaky pop

Question 3

Test for carbon dioxide

Answer 3

Reacts with calcium hydroxide solution to produce a white precipitate of calcium carbonate. Limewater is a solution of calcium hydroxide. If carbon dioxide is bubbled through, the limewater will turn cloudy

Question 4

Test for chlorine

Answer 4

Damp blue litmus paper turns red and then bleaches when placed in chlorine