11) 2
Figure 2 shows the apparatus that a leamer set up.
181
glass tube
rubber bung
cotton wool soaked in
ammonia solution
cotton wool soaked in
concentrated hydrochloric acid
Figure 2
The white solid is formed because the molecules of hydrogen chloride gas and ammonia gas move at
random throughout the tube and eventually react with each other.
(a)
State the name given to this random movement of molecules.​