Sugar and Sulfuric Acid

Description:  When sulfuric acid is added to sugar it removes the water leaving elemental carbon. The water quickly turns to water vapor creating the pores in the black snake-like column. This dramatic phenomenon can be used to illustrate chemical reactions, thermal energy released during a reaction, and conservation of mass. Safety precautions should be taken whenever dealing with acids.

Web Resource:  Sulfuric Acid and Sugar Demonstration - Thought Co.