Group 7 Halogens

Question 1

Why boiling point increases moving down

Answer 1

Atoms are larger, stronger intermolecular forces,

Question 2

colour of florine

Answer 2

Pale yellow gas

Question 3

Colour of chlorine

Answer 3

Pale green gas

Question 4

Colour of

Bromine

Answer 4

Dark red brown liquid

Question 5

Colour iodine

Answer 5

Dark grey solid, can undergo sublimation and turn into a purple gas

Question 6

Halogen means

Answer 6

Salt producing

Question 7

Astatine colour

Answer 7

Black solid

Question 8

Reactivity going down group 7

Answer 8

Atomic radius increases going down the group
So incoming electron is further from the nucleus, more shells so more shielding
Weaker nuclear attraction for an incomming electron sonhardr to form an ion

Question 9

Chlorine in water

Answer 9

Pale green solution

Question 10

Bromine in water

Answer 10

Orange solution

Question 11

Iodine in water

Answer 11

Brown solution

Question 12

What halogen displaces what halogen

Answer 12

More reative halogen will displace a less reactive halogen from a solution of one of its salt

Question 13

colour of halide salts

Answer 13

Mostly colourless

Question 14

Proof of ionic equation

2KBr(aq) +Cl2 (aq) -> 2KCl +Br2

Answer 14

2KBr(aq) +Cl2 (aq) -> 2KCl +Br2

2K- + 2Br + Cl2 -> 2K+ + 2Cl- + Br2

Ionic equation:
2Br + Cl2 -> 2Cl- + Br2

Question 15

What type of reaction are displacement reaction

Answer 15

Always redox

Question 16

What is reducing agent

Answer 16

The one oxidised (opposite)