Complex sentence: Boiling chips are often added in distilling flasks for distillations or boiling chemical reactions to allow a nucleation site for gradual boiling to avoid a sudden boiling surge where the contents may overflow from the boiling flask.
Split into simpler sentences: Boiling chips are often added in distilling flasks for distillations or boiling chemical reactions to allow a nucleation site for gradual boiling. This nucleation avoids a sudden boiling surge where the contents may overflow from the boiling flask.