Chapter 11


All processes involve energy. In this chapter, the key is the energy in chemical processes. Adding or removing heat may cause a phase change or a change in temperature. The specific heat of a substance is a useful factor relating the energy, mass, and temperature change. Calorimetry uses specific heat, temperature change, and mass to determine the energy involved in a chemical process. Heats of formation are a useful alternative to calorimetry for determining energy changes. Hess’s law allows you to predict energy changes when calorimetry or heats of formation are inadequate.

The Problems You’ll Work On

In this chapter, you work with thermochemistry in the following ways:

check.png Doing temperature conversions

check.png Interpreting energy and phase changes

check.png Completing specific heat and calorimetry problems

check.png Calculating with standard heats of formation

check.png Finding enthalpy changes with Hess’s law

What to Watch Out For

Remember the following when working on thermochemistry:

Dimensional ...

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