tests for gases

Question 1

test for hydrogen

Answer 1

squeaky pop test
- collect sample of gas in tube
- attempt to ignite gas using lit splint

Question 2

test for oxygen

Answer 2

glowing splint test
- collect sample of gas in test tube
- place glowing splint into test tube

Question 3

test for presence of water

Answer 3

copper sulphate test
- add anhydrous copper sulphate
- changes from white to blue

Question 4

test for purity of water

Answer 4

measure boiling point
- measure its boiling point
- closer it is to 100 degrees Celsius = more pure

Question 5

test for carbon dioxide

Answer 5

limewater test
- bubble sample of gas through limewater
- turns cloud if CO2 is present

Question 6

test for chlorine

Answer 6

damp blue litmus paper
- place damp blue litmus paper in sample of gas
- if it turns white, chlorine is present

Question 7

test for ammonia

Answer 7

damp red litmus test
- place damp red litmus paper in sample of gas
- if it turns blue, ammonia is present