Thermochemistry
Chapter 5
Thermochemistry is the study of heat and its relation to chemical reactions.
Thermochemistry Vocabulary
exothermic: a change that releases heat (i.e. combustion reactions)
endothermic: a change that absorbs heat (i.e. icy-hot or a cold pack)
enthalpy (H): sum of internal energy
Change of enthalpy (ΔH): final enthalpy minus initial enthalpy. Note that changes in enthalpy are additive; which is known as Hess's law.
ΔH <0: exothermic
ΔH > 0: endothermic
Heat (q): the thermal energy that is transferred from one object to another. When pressure is constant, heat and change in enthalpy are equal.
Important Equations
m is the mass, C is the specific heat, and ΔT is the change in temperature
Problem Solving with Enthalpy (~3 min)
A Commone Hess's Law Question (3:10)
Calorimetry Examples (4:13)
Math Resources
Below are some potentially useful math resources for this chapter. Click on the names of the sections to view the resources.