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Elements, Compounds and Mixtures
Diffusion of Bromine through Air.
Bromine is a red-brown
liquid that boils at
58 °C.
Bromine gas is also red-brown and can be seen inside a gas jar.
If bromine
gas is allowed to enter a gas
jar containing a vacuum,
the red-brown colour instantly fills the jar
because there are no air molecules to collide with.
This shows that the bromine
molecules are moving fast.
When bromine is added to a gas
jar filled with air,
the red-brown gas is seen to slowly
diffuse through the air.
The many collisions between the
bromine molecules and the air molecules
slow down the rate at which the
red-brown bromine gas fills the
jar.
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