group 7

Question 1

What does bromine look like?

Answer 1

A brown liquid

Question 2

All the halogens exist as ____ molecules

Answer 2

diatomic (always a 2)

Question 3

What happens to the melting points and boiling points as you go down group 7?

Answer 3

they increase going down group 7.

Question 4

chlorine is what colour and state?

Answer 4

pale green gas

Question 5

bromine is what colour and state?

Answer 5

brown liquid

Question 6

iodine is what colour and state?

Answer 6

purple-black solid

Question 7

melting and boiling points increase down group 7 because…

Answer 7

-larger molecules
-intermolecular forces become stronger
-more energy is needed to break the forces

Question 8

are group 7 metal or non-metal

Answer 8

non-metal

Question 9

group 7 displacement
[4]

Answer 9

-atoms become larger
the outer shell becomes further from the nucleus
-the force of attraction between the nucleus and the outer shell decreases
-an outer electron is gained less easily
-the halogen becomes less reactive

Question 10

why are molecule melting/boiling points so low?

Answer 10

-simple molecules
-little energy needed to break weak intermolecular forces

Question 11

reactivity _____ down group 7

Answer 11

decreases