Group 7

Question 1

Name products of reaction of Br2 (aq) + 2NaCl (aq)

Answer 1

Br2 + 2NaCl
no reaction
as bromine cannot displace chlorine as chlorine is higher up in group 7

Question 2

define an oxidising agent

Answer 2

electron acceptor

Question 3

Give half equation for oxidation for bromide ions

Answer 3

2Br^- -> Br2 + 2e^-

Question 4

State observation for this reaction
Cl2 (aq) + 2NaI(aq) -> I2 (aq) + 2NaCl (aq)

Answer 4

Brown solution I2 is formed

Question 5

why is chlorine added to drinking water

Answer 5

to kill bacteria

Question 6

what is observed in this reaction
Ag^+ (aq) + I^- (aq) -> AgI (aq)

Answer 6

yellow precipitate

Question 7

What is the observation when sulfur is formed in a redox reaction in a reaction using sulfuric acid

Answer 7

Yellow solid

Question 8

What is the test for halide ions

Answer 8

Acidified silver nitrate (AgNO3)

Question 9

What is observed when dilute ammonia (NH3) is added to AgCl

Answer 9

White precipitate dissolves

Question 10

Name products of reaction of I2 (aq) + 2NaCl (aq)

Answer 10

No reaction as brown solution remains

Question 11

State observation for reaction Cl2 (aq) + 2NaBr (aq) -> Br2 (aq) + 2NaCl (aq)

Answer 11

Orange / brown solution is formed (Br2 is formed)

Question 12

What is the observation when SO2 is formed in a reaction using sulfuric acid

Answer 12

acidic gas

Question 13

chlorine is toxic. Why is it not dangerous to add it to drinking water

Answer 13

It is added in low concentations

Question 14

Give products of reaction of Cl2 (g) + 2NaOH (aq)

Answer 14

NaCl (aq) + NaClO (aq) + H2O (l)

Question 15

Give products of equation of NaCl (s) + H2SO4 (aq)

Answer 15

NaHSO4 (s) + HCl (g)

Question 16

What is observed when bromide ions reactant with sulfuric acid in a redox reaction

Answer 16

Acidic gas (SO2)
Brown fumes (Br2)

Question 17

What is the observation when adding iodine is formed in a reaction with sulfuric acid

Answer 17

Black solid

Question 18

What is observed when concentrated ammonia is added to AgBr

Answer 18

cream precipitate dissolves

Question 19

define reducing agent

Answer 19

electron donor

Question 20

What is observed in this reaction in Ag^+ (aq) + Cl^- (aq) -> AgCl (aq)

Answer 20

white precipitate

Question 21

What is observed in equation Ag^+(aq) + F^- (aq) -> AgF (aq)

Answer 21

colourless solution

Question 22

Why must a halide solution be acidified before testing with silver nitrate

Answer 22

to remove carbonate ions

Question 23

What is observed in reaction of NaCl (s) + H2SO4 (aq) -> NaHSO4 (aq) + HCl (g)

Answer 23

Steamy fumes

Question 24

Focus only on 1.2)

Answer 24