 We will look at some reactions of chlorine gas. To generate the chlorine gas, we will add some concentrated sulfuric acid to bleach. The chlorine is a very reactive non-metal, since it has a very high electronegativity. We will not react this with a group one metal, since this reaction is very hazardous. We bring in a heated piece of copper metal. The reaction is very exothermic. The copper chloride that is produced liquefies and drips off the surface of the metal. The copper chloride dissolves in the solution at the bottom of the bottle, giving a characteristic blue color from the copper plus 2 ion.