II.B. Heating Curves - Collier's Classroom
Download
Report
Transcript II.B. Heating Curves - Collier's Classroom
Heating Curves and
Phase Diagrams
Heating Curves
Temperature
Change
• change in KE (molecular motion)
• depends on heat capacity
Heat
Capacity
• energy required to raise the temp of 1
gram of a substance by 1°C
Heating Curves
Gas - KE
Boiling - PE
Liquid - KE
Melting - PE
Solid - KE
Heating Curves
Phase
Change
• change in PE (molecular arrangement)
• temp remains constant
Heat
of Fusion (Hfus)
• energy required to melt 1 gram of a
substance at its m.p.
Heating Curves
Heat
of Vaporization (Hvap)
• energy required to boil 1 gram of a
substance at its b.p.
• usually larger than Hfus…why?
EX:
sweating,
steam burns
Phase Diagrams
The
conditions of pressure and
temperature at which to phases exist
in equilibrium are indicated by the
line separating the two phases
Triple Point: set of conditions at
which all 3 phases can exist
Phase Diagram of Water