Chemical tests

Question 1

Lithium ions burn with what colour flame

Answer 1

Red

Question 2

Sodium ions burn with what colour flame

Answer 2

Yellow

Question 3

Potassium ions burn with what colour flame

Answer 3

Lilac

Question 4

Calcium ions burn with what colour flame

Answer 4

Orange-red

Question 5

Copper ions burn with what colour flame

Answer 5

Blue-green

Question 6

Some metals form a coloured precipitate with what

Answer 6

sodium hydroxide (NaOH)

Question 7

Copper(II) ion form what colour precipitate

Answer 7

Blue

Question 8

Iron(II) ion form what colour precipitate

Answer 8

Sludgy green

Question 9

Iron (III) ion form what colour precipitate

Answer 9

Reddish brown

Question 10

How can you check for ammonia ions

Answer 10

If damp red litmus paper turns blue

Question 11

How do you test for carbonate ions

Answer 11

Hydrochloric acid, gives of carbon dioxide

Question 12

How do you test for sulfate ions

Answer 12

Hydrochloric acid and barium chloride, produces a white precipitate of barium sulfate

Question 13

How do you test for halides (chloride, bromide, iodide)

Answer 13

Nitric acid and sliver nitrate gives off these precipitates:

chloride ions: white precipitate
bromide ions: cream precipitate
iodide ions: yellow precipitate

Question 14

Wet copper colour?
Dry copper colour?

Answer 14

Wet: blue
Dry: white

Question 15

Chlorine test

Answer 15

Bleaches damp litmus paper

Question 16

Carbon Dioxide test

Answer 16

Turns limewater cloudy

Question 16

Oxygen test

Answer 16

Relights glowing splint

Question 17

Ammonia test

Answer 17

Turns damp red litmus paper blue (and has a very strong unpleasant smell)

Question 18

How can you test for water

Answer 18

Copper (II) sulphate

Question 18

Hydrogen test

Answer 18

Squeaky pop with lit splint