start chemical energy stuff (calorimetry, (exo|endo)thermic equations

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+# Chemical energy
+
+Chemical energy = heat content = enthalpy
+
+$$\Delta H = H_{\text{products}} - H_{\text{reactants}}$$
+
+**Exothermic** - energy released from system  
+**Endothermic** - energy absorbed by system
+
+Must specify states (latent heat)
+
+## Calorimetry
+
+$$E = mc \Delta T$$
+
+$$\text{calibration factor} = {E \over \Delta T} = {VIt \over \Delta T} \quad \text{J/K}$$
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