Group 0 - the noble gases

Question 1

what group are the noble gases in? what do they exist as?

Answer 1

-0
-single atoms

Question 2

describe the boiling point of noble gases:

Answer 2

low

Question 3

what happens to the boiling point as you go down the group?

Answer 3

it increases

Question 4

why does the boiling point increase as you go down the group? (3)

Answer 4

-the atoms become larger
-the intermolecular forces between the atoms become stronger
-more energy is needed to overcome these forces

Question 5

what is the density of noble gases like? what happens to it as you go down the group?

Answer 5

-low
-increases

Question 6

what are noble gases chemically identified as? what does this mean?

Answer 6

inert
-extremely unreactive

Question 7

why are noble gases inert? (2)

Answer 7

-The atoms of noble gases already have complete outer shells,
-so they have no tendency to lose, gain, or share electrons.

Question 8

if noble gases are inert, what happens when they come into contact with fire? what are they not?

Answer 8

nothing, they are not flammable

Question 9

why is Helium is used as a lifting gas in party balloons and airships? (2)

Answer 9

-less dense than air, so balloons and airships rise
-non-flammable so the helium cannot set on fire

Question 10

why is Argon is used as a ‘shield gas’ when welding pieces of metal together? (2)

Answer 10

-denser than air, so it stops air getting to the metal
-inert, so the hot metal cannot oxidise and spoil the weld

Question 11

Explain why argon, krypton or xenon are used in filament lamps. (3)

Answer 11

-The hot metal wires will burn away if any oxygen from air is present in the lamp.
-Argon, krypton and xenon are very unreactive.
-They replace the air inside the lamp, preventing the metal wire from burning away.