Chemical Tests

Question 0

Oxygen

Answer 0

Glowing splint relights

Question 1

Acid

Answer 1

Litmus goes red

Methyl orange red –> orange

Question 2

Hydrogen

Answer 2

Lit splint explodes with a squeaky pop

Question 3

Carbon dioxide

Answer 3

Bubble through limewater and it goes cloudy

Question 4

Chlorine

Answer 4

Damp red litmus paper bleaches

Question 5

Ammonia

Answer 5

Damp red litmus paper goes blue

Question 6

Alkenes

Answer 6

Bromine water goes orange –> colourless

Question 7

Water

Answer 7

Anhydrous copper 2 sulphate white to blue
OR
Cobalt chloride blue to pink
OR
For pure boils at 100c

Question 8

Li*

Answer 8

Dip wore loop in conc hydrochloride acid then into solid compound and place in Bunsen burner flame
Crimson flame

Question 9

Na*

Answer 9

Dip wore loop in conc hydrochloride acid then into solid compound and place in Bunsen burner flame
Orange / yellow flame

Question 10

K*

Answer 10

Dip wore loop in conc hydrochloride acid then into solid compound and place in Bunsen burner flame
Lilac flame

Question 11

Ca2*

Answer 11

Dip wore loop in conc hydrochloride acid then into solid compound and place in Bunsen burner flame
Brick red

Question 12

Cu2*

Answer 12

Aqueous sodium hydroxide
Blue precipitate
Cu(OH)2

Question 13

Fe2*

Answer 13

Aqueous sodium hydroxide
Green precipitate
Fe(OH)2

Question 14

Fe3*

Answer 14

Aqueous sodium hydroxide
Brown precipitate
Fe(OH)3

Question 15

Ammonium NH4*

Answer 15

Aqueous sodium hydroxide WARM

Bubbles of gas turns damp red litmus paper blue

Question 16

Cl-

Answer 16

Dilute nitric acid then silver nitrate
White precipitate
AgCl

Question 17

Br-

Answer 17

Dilute nitric acid then silver nitrate
Cream precipitate
AgBr

Question 18

I-

Answer 18

Dilute nitric acid then silver nitrate
Yellow precipitate
AgI

Question 19

Carbonate

Answer 19

Add acid

Bubbles of gas (CO2)

Question 20

Sulphate

Answer 20

Add dilute hydrochloride acid then barium chloride
White precipitate
BaSO4