Enthalpy

• Enthalpy is the energy stored in chemical bonds
• The symbol for Enthalpy is H 
• The units for Joules(J)
• Change in enthalpy is ΔH (Delta H)
• In Exothermic reactions enthalpy decreases.
• In Endothermic reactions enthalpy increases

Exothermic Reaction

Endothermic Reaction
A) Calorimetry

• Measured by a calorimeter
• To experimentally determine the heat released we need to know 3 things:

1) temperatureChange (Delta T)
2) Mass (m)
3)Specific Heat Capacity (c)
These are related by the equation:
ΔH= mCΔT or mC(Tf-Ti)