Paper 2- Unit 8 Chemical tests (Triple Only)

Question 1

Which metal gives a green flame?

Answer 1

Copper Cu 2+

Question 2

Which metal gives a orange-red flame?

Answer 2

Calcium Ca2+

Question 3

Which metal give a lilac flame?

Answer 3

Potassium K+

Question 4

Which metal gives a yellow flame?

Answer 4

Sodium Na+

Question 5

Which metal gives a crimson flame?

Answer 5

Lithium Li+

Question 6

What is hydrochloric acid used for?

Answer 6

Clean the loop/wire (1)

Question 7

Describe how to carry out a flame test (4)

Answer 7

Dip clean loop into sample
Place in blue flame (bunsen burner)
Write down colour
Clean loop with HCl

Question 8

Sodium hydroxide and aluminium (1)

Answer 8

Whiteppt

dissolved in excess NaOH

Question 9

Sodium hydroxide and calcium (1)

Answer 9

White ppt

doesn’t dissolve

Question 10

Sodium hydroxide and magnesium (1)

Answer 10

White ppt

doesn’t dissolved in excess NaOH

Question 11

Sodium hydroxide and iron (II) (1)

Answer 11

green ppt

Question 12

Sodium hydroxide and Iron (III) (1)

Answer 12

red- brown ppt

Question 13

Sodium hydroxide and copper (1)

Answer 13

Blue ppt formed

Question 14

What is the test for a sulphate? (1)

Answer 14

white ppt formed

with barium chloride solution

Question 15

What is the test for a carbonate?

Answer 15

add acid

bubbles of CO2 given off

test gas with limewater

turns clear to cloudy

Question 16

What is the test for the halides? (2)

Answer 16

Add nitric acid

then silver nitrate

chloride = white ppt
Bromide = cream ppt
Iodide = yellow ppt

Question 17

Green flame

Answer 17

Copper Cu2+

Question 18

orange red flame

Answer 18

Calcium Ca2+

Question 19

a lilac flame

Answer 19

Potassium K+

Question 20

yellow flame

Answer 20

Sodium Na+

Question 21

crimson

Answer 21

Lithium Li+

Question 22

How do you clean the loop/wire? (flame test)

Answer 22

Clean hot wire

with hydrochloric acid

Question 23

Sodium hydroxide test produces white ppt

Answer 23

either aluminium, calcium or magnesium

Question 24

Sodium hydroxide test produces iron (II)

Answer 24

green ion

Question 25

Sodium hydroxide test produces iron (III)

Answer 25

brown ion

Question 26

Sodium hydroxide test produces blue ppt

Answer 26

copper ion