1. Ch. 17
Calculating Heat

2. Heat Equation
c is also written as Cp units are : J/goC or cal/goC

3. Moving left to right(a-e)  is ENDOTHERMIC
Solid -> Liquid -> Gas
Must put energy in to melt/boil
Energy goes into breaking bonds if temp is same
Moving Right to left (e-a)  is EXOTHERMIC
Gas -> Liquid -> Solid
Energy is release in condensation/freezing
Energy is released as bonds form keeping temp same

4. Phase changes Endothermic: melting, boiling
Exothermic: condensation, freezing
      (B-C) Heat of fusion:   Q= m      fusion
      (D-E)Heat of vaporization: Q=m     vap

5. Phase change Equation
For phase changes, use a different equation because there is no temp. change
Q = m fusion
Q = m vap

6. Heat Curve for Water
- Helps us visualize