Practice question · Put in order
Order the heating of a pure substance from solid to gas at constant pressure.
- Solid is heated; temperature rises until melting point
- Vaporisation: temperature constant while liquid converts to gas (_vap absorbed)
- Melting: temperature constant while solid converts to liquid (_fus absorbed)
- Liquid is heated; temperature rises until boiling point
Hints
- Temperature rises within a phase and pauses during a transition.
- The substance must melt before it can boil.
Show the answer
- Solid is heated; temperature rises until melting point
- Melting: temperature constant while solid converts to liquid (_fus absorbed)
- Liquid is heated; temperature rises until boiling point
- Vaporisation: temperature constant while liquid converts to gas (_vap absorbed)
Why
The flat sections in a heating curve correspond to phase transitions at constant T; energy goes into breaking intermolecular forces.
Practise States of matter and phase behaviour
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