IB Physics SL B.1.8 Phase change
IB Physics SL B.1.8 Phase change
Explain constant-temperature melting, boiling and freezing by linking phase-change plateaus on graphs to energy stored in bonds.
How this is tested
- read a T-time or T-energy graph plateau and state that average molecular kinetic energy stays constant
- explain that energy supplied or removed changes intermolecular potential energy during the phase change
- choose or sketch a T-Q graph with a flat section at the melting or freezing point