1# Chemical energy23Chemical energy = heat content = enthalpy45$$\Delta H = H_{\text{products}} - H_{\text{reactants}}$$67**Exothermic** - energy released from system8**Endothermic** - energy absorbed by system910Must specify states (latent heat)1112## Calorimetry1314$$E = mc \Delta T$$1516$$\text{calibration factor} = {E \over \Delta T} = {VIt \over \Delta T} \quad \text{J/K}$$