Sodium chloride, commonly known as table salt, is a notoriously inert substance. However, its constituent elements, sodium (Na) and chloride (Cl), are both extremely reactive and dangerous. The reaction between the two is highly exothermic and results in a cloud of sodium chloride smoke.
In this demonstration, the glass container is filled with chlorine gas. Sodium metal is heated over a Bunsen burner and submerged into the gas to initiate the reaction.
Source: https://youtu.be/d2geiGKFveE (UCBerkeley)
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