5.2 gas test

Question 1

Test for hydrogen

Answer 1

squeaky pop test

collect a sample of gas in a test tube
attempt to ignite the gas using a lit splint
positive result squeaky pop

Question 2

test for oxygen

Answer 2

glowing splint

collect a sample of gas in a test tube

place a glowing splint into test tube

positive result- the splint relights

Question 3

test for water

Answer 3

we test for water in two ways
presence:
1. Add anhydrous copper sulphate (cuSO4)
positive result it changes from white to blue
Purity:
2. We measure it’s boiling point
positive result -closer 100c= more pure

Question 4

test for carbon dioxide

Answer 4

limewater test
bubble a sample of gas through lime water

positive result- lime water turns cloudy( White precipitates forms)

Question 5

test for chlorine

Answer 5

damp blue litmus paper

place damp blue litmus paper in a sample of gas

positive result - it turns white (bleaches it )

Question 6

Test for ammonia

Answer 6

damp red litmus paper
place damp red litmus paper in a sample of gas
positive result - it turns blue

Question 7

Flame test for Li result

Answer 7

Red

Question 8

flame test for Na result

Answer 8

yellow

Question 9

flame test for k result

Answer 9

lilac

Question 10

flame test for Ca2+ result

Answer 10

Orange- red

Question 11

flame test for Cu2+ result

Answer 11

blue- green