tests

Question 1

test for hydrogen

Answer 1

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

Question 2

test for oxygen

Answer 2

collect a sample of gas in a test tube, place a glowing splint into the tube which results in the splint re lighting

Question 3

test for water

Answer 3

anhydrous copper sulphate - CuSO4 goes from white to blue

Question 4

test for carbon dioxide

Answer 4

bubble the gas through limewater and it turns cloudy due to white precipitate forming

Question 5

test for chlorine

Answer 5

damp blue litmus paper turns white - as it bleaches it

Question 6

test for ammonia

Answer 6

damp red litmus paper turns blue

Question 7

why does red litmus paper turn red when ammonia is present

Answer 7

ammonia reacts with the water to make OH- ions, they are alkaline so it turns blue