tests Flashcards
1
Q
test for hydrogen
A
collect a sample of gas in a test tube, try to ignite the gas using a lit splint which will result
in a squeaky pop
2
Q
test for oxygen
A
collect a sample of gas in a test tube, place a glowing splint into the tube which results in the splint re lighting
3
Q
test for water
A
anhydrous copper sulphate - CuSO4 goes from white to blue
4
Q
test for carbon dioxide
A
bubble the gas through limewater and it turns cloudy due to white precipitate forming
5
Q
test for chlorine
A
damp blue litmus paper turns white - as it bleaches it
6
Q
test for ammonia
A
damp red litmus paper turns blue
7
Q
why does red litmus paper turn red when ammonia is present
A
ammonia reacts with the water to make OH- ions, they are alkaline so it turns blue
