A small piece of sodium metal is placed in a flask of chlorine gas. A little water helps expose the sodium so it can react with the chlorine gas. The reaction releases a lot of heat as the ionic ...

Metal Reaction with water Reaction with steam Reactivity Potassium ... Reaction too dangerous to be attempted. Most reactive Sodium (Na) Reacts vigorously. Floats on the surface.

The apparatus below is used to react calcium with water and collect the gas. This would not be used with sodium or potassium as they float and the reaction is too vigorous.

The reaction of the potassium with water is similar to the reaction of sodium in water but hotter. The demonstration shown in this video is very dangerous. Do not attempt to perform this demonstration ...