Group 7

Question 1

Chlorine appearance at RTP

Answer 1

green/yellow gas

Question 2

Bromine appearance at RTP

Answer 2

brown/red liquid with orange vapour

Question 3

what is Iodine appearance at RTP

Answer 3

grey solid with purple vapour

Question 4

DOWN the group, the reactivity……

Answer 4

Decreases

Question 5

Reactivity decreases down the group because……

Answer 5

• outer electron shell becomes more further away from nucleus
• more electron shielding
• harder to gain another electron due to weak electromagnetic attraction

Question 6

DOWN the group, melting and boiling points…….

Answer 6

Increase

Question 7

Melting/Boiling points increase down the group because……

Answer 7

• atom becomes larger (due to more shells)
• intermolecular forces increase
• more energy needed to overcome forces

Question 8

Test for chlorine?

Answer 8

• damp blue litmus paper in gas

- will turn red then bleach white

Question 9

metal + halogen —->

Answer 9

Metal halide

Question 10

metal halides are known as…..

Answer 10

halide salts

Question 11

hydrogen + halogen —–>

Answer 11

Hydrogen halide

Question 12

When you dissolve a hydrogen halide into water…

Answer 12

it becomes an acid solution (aqueous)

Question 13

Most reactive halogen?

Answer 13

Fluorine

Question 14

Least reactive halogen?

Answer 14

Astitane

Question 15

when CHLORINE displaces metal BROMIDE, what colour is the solution.

Answer 15

The solution will turn orange (from bromine ions)

Question 16

when CHLORINE displaces metal IODIDE, what is seen

Answer 16

the solution turns brown (from iodine)