1. Look at the pictures is helium denser than air?
It changes from a solid to a liquid at -272oC.
It changes from a liquid to a gas at -269oC.
This is a maglev train. It uses powerful electromagnets to push and pull it along a track that it levitates above. It uses a lot less energy than conventional trains but has to be kept really cold, helium is used for this.
A weather balloon
Helium gas is used to surround the welding because it is unreactive so oxygen cannot get to the hot metal to react with it
Helium gas is an unreactive (inert), colourless, and odourless
Questions
What is the atomic mass of Helium?
What is the boiling point?
What is the melting point?
What are the physical properties of the gas?
What is Helium used for?

2. When electricity is passed through neon gas it glows red
It changes from a solid to a liquid at -249oC.
It changes from a liquid to a gas at -246oC.
Neon gas is an unreactive, colourless, and light.
Neon is a very common element in the universe but is fairly rare on the Earth
Neon or neon-helium
gas lasers produce an
intense beam of red light. They are used in the bar code readers at supermarket checkouts.
Questions
What is the atomic mass of Neon?
What is the boiling point?
What is the melting point?
What are the physical properties of the gas?
What is Neon used for?

3. Argon
The gas inside light bulbs is Argon because it won’t react with the hot filament
It changes from a solid to a liquid at -189oC.
It changes from a liquid to a gas at -186oC.
Argon is the third most common gas in the Earth’s atmosphere after nitrogen and oxygen
Argon laser is green light focused to cause a microscopic burn. The aim of the burn is to kill sick tissue to prevent complications resulting from
Argon is used to kill pigs humanely if there is an outbreak of some disease on the farm The Argon takes the place of the oxygen in the air
Argon is a colourless, odourless, non-flammable, non-reactive gas
Questions
What is the atomic mass of Argon?
What is the boiling point?
What is the melting point?
What are the physical properties of the gas?
What is Argon used for?