Chemistry II AP Objectives

Links:

College Board Topic III:
Reactions

Topics:

5. Thermodynamics
   1. State functions
   2. First law: change in enthalpy; heat of formation; heat of reaction; Hess's law; heats of vaporization and fusion; calorimetry
   3. Second law: entropy; free energy of formation; free energy of reaction; dependence of change in free energy on enthalpy and entropy changes
   4. Relationship of change in free energy to equilibrium constants and electrode potentials

Time Range:
See course calendar

Suggested Teaching Strategies:
III. E. 1-4: Thermo is a new and abstract concept for students. It is helpful to start from a place they are comfortable. Begin with hands on activities of mixing liquids and solids at various temperatures and have them predict the temperature of the mix. Build from these "tests" to heat capacity, changes in enthalpy then on to heat of reaction. Bridge to theoretical concepts of state functions and the first law of thermodynamics. Introduce Hess's law as an algebra exercise. Have students confirm concept in laboratory work. Conclude 1st law unit with lesson on calorimetry. Use the David Farnan science project to demonstrate the differences heat retained based on the shell and filler.

Aligned Resources:

• Core lab 8 - Hess' Law
• Core lab 9 - Heat of Combustion
• Wings video on Chemical Energy Changes
• Standard Deviants video
• Brown and LeMay CD
• Chem Source CD

Revision Date:
May 2001