Add boiling chips to a boiling liquid?

Never add a boiling chip to a hot liquid, because it can cause immediate boiling over of the solution. If you forget to add a boiling chip before you begin, you must cool the solution before adding...

Boiling chips are used to ensure that a liquid being heated does not super-heat and 'erupt' or explode but rather has a 'seed' surface to initiate smooth boiling.

http://orgchem.colorado.edu/hndbksupport/dist/boilchip.html Boiling chips are small, insoluble, porous stones made of calcium carbonate or silicon carbide. These stones have pores inside which...

The temperature at which the pressure of the evaporating liquid equals the atmospheric pressure of the surroundings. For pure water at sea level on earth, this is 100 degrees celsius.

Boiling chips provide a surface on which vapor bubbles can form. This bubble formation helps prevent superheating and bumping of the liquid.