This I/GCSE Chemistry blog post is the second part of the important experiments needed to know for the movements of particles:
Ammonia and Hydorgen Chloride
1.) Aqueous ammonia (NH), gives off ammonia gas. Hydrochloric acid (HCl) gives off hydrogen chloride gas.
2.) If you set up an experiement like this you'll get a white ring of ammonium chloride.
3.) The NH3 gas diffuses from end of the tube and the HCl gas diffuses frm the other. When they meet they react to form ammonium chloride.
4.) The ring doesn't form exactly in the middle of the glass tube - it forms nearest the end of the tube where the hydrochloric acid was.
5.) This is becuase the particles of ammonia are smaller and lighter than the particles of hydrogen chloride, so they diffuse through the air more quickly.
Bromine Gas and Air
1.) Bromine gas is a brown, strongly smelling gas. You can use it to demonstrate diffusion in gases.
2.) Fill half a gas jar full of bromine gas, and the other half full of air - separate the gases with a glass plate.
3.) When you remove the glass plate, you'll see the brown bromine gas slowly diffusing through the air.
4.) The random motion of the particle means that the bromine will eventually diffuse right through the air.
That is all!
