Test for Gases

Question 1

Test for oxygen

Answer 1

-hold glowing splint in a test tube with sample gas
-splint will relight if oxygen is present

Question 2

Test for hydrogen

Answer 2

-hold lighted splint in test tube with sample gas
-pop sound is heard if hydrogen is present

Question 3

Test for carbon dioxide

Answer 3

-carbon dioxide reacts with calcium hydroxide to form a white precipitate of calcium carbonate
-sample gas is bubbled through limewater
-limewater turns milky/cloudy white if carbon dioxide is present

Question 4

Test for chlorine

Answer 4

-damp litmus paper held in a test tube with sample
-paper turns red (from the water on the paper) then white if chlorine is present