tests for ions + gases (paper 1)

Question 1

hydrogen chemical test + result

Answer 1

chemical test = lighted splint
result - squeaky pop

Question 2

oxygen chemical test + result

Answer 2

chemical test = glowing splint
result = re-lights

Question 3

carbon dioxide chemical test + result

Answer 3

chemical test = bubble through limewater
result = cloudy white

Question 4

chlorine chemical test + result

Answer 4

chemical test = damp blue litmus paper
result = bleached white (may turn red first)

Question 5

ammonia chemical test + result

Answer 5

chemical test = damp red litmus paper
result = turns blue

Question 6

Cu^2+ in colour of precipitate on addition of NaOH

Answer 6

blue precipitate

Question 7

Fe^2+ in colour of precipitate on addition of NaOH

Answer 7

green precipitate

Question 8

Fe^3+ in colour of precipitate on addition of NaOH

Answer 8

brown precipitate

Question 9

Fe^2+ in metal cation solution

Answer 9

sludgy green precipitate

Question 10

Fe^3+ in metal cation solution

Answer 10

reddish brown precipitate

Question 11

Cu^2+ in metal cation solution

Answer 11

blue precipitate

Question 12

what colour precipitate do chloride ions produce?

Answer 12

white

Question 13

colour of lithium in flame test

Answer 13

red

Question 14

colour of sodium in flame test

Answer 14

yellow

Question 15

colour off potassium in flame test

Answer 15

lilac

Question 16

colour of copper in flame test

Answer 16

blue-green