Group 7 (Halogens)

Question 1

Fluorine properties

Answer 1

-220 melting point, -188 boiling point, yellow gas appearance . Used as rocket fuel

Question 2

Chlorine properties

Answer 2

-10 melting point, -35 boiling point , green gas appearance , used to make drinking water ,

Question 3

Bromine properties

Answer 3

-7 melting point, 59 boiling point , red/orange liquid appearance, cleans water of harmful micro organisms

Question 4

Iodine properties

Answer 4

114 melting point, 184 boiling point , purple solid, used as an antiseptic in medicine

Question 5

Reactivity trends in group 7

Answer 5

As you move down the group
- more electrons
- more shells
- distance between outer electron and nucleus increases
- more shielding by inner electron
- harder to gain an electron
Melting and boiling point increase
A more reactive halogen will displace a less reactive halogen from a solution of its salt