Thermochemistry is the study of heat effects in chemical reactions. In this chapter you will learn that heat is the transfer of kinetic energy from hotter to colder objects. The heat absorbed or released during a chemical reaction carried out at constant pressure is the change in enthalpy of the reaction (H). You will learn to use Hess's law to calculate the heat of reaction. Finally, you will be introduced to calorimetry, a process used to measure the heats of chemical and physical changes.

In this chapter, you will learn: to distinguish between exothermic and endothermic reactions to explain what is meant by enthalpy and enthalpy change to apply Hess's law to determine H° for a reaction to describe how a calorimeter determines heats of reactions to compare heat and temperature