This site provides information on Chemical Energy. It includes concepts of chemical thermodynamics, including a lengthy section about the standard enthalpy of formation.

Find out what entropy and enthalpy have to do with a spontaneous chemical reaction. [3:44]

Check out answers to many common questions about energy and its relationship to chemical change. Understand details in topics such as enthalpy and thermochemistry with these FAQ.

Using an illustrated example, the difference between an endothermic and an exothermic reaction is described. The concept of enthalpy, or heat energy change, is explained, and the energy diagrams of reactions are presented.

This resource provides a physical reaction. Hydrous and anhydrous calcium chloride react with water to produce physical exothermic and endothermic reactions.

A step-by-step example of how to complete Hess's Law problems. This example includes all the manipulations that may be required for Hess's Law.

An animation to investigate the rates of heating or cooling in a calorimeter. Also, molar enthalpy of solution of sulfuric acid is discovered.

Nice page includes a great deal of background on both bond length and bond dissociation energy. Includes a small table of bond energies as well as sample problems, graphics, and skill questions.

The Classius-Clapyron equation can be used to determine the enthalpy of vaporization from vapor pressure measurements over a range of temperatures. In this simulation students are asked to create the appropriate plot of the data and use...

Interactive site that generates random Hess's Law problems for you to solve. Allows you immediate feedback on your ability to use Hess's Law.

With an overview of topics related to chemical equilibrium, this site provides a foundation to a study of thermodynamics and energy. The site specifically addresses free energy and the Gibbs function.

[Free Registration/Login may be required to access all resource tools.] Students determine the temperature at which a reversible reaction will achieve equilibrium by using the Gibbs free energy equation, and then describe the...

Explanation of Gibbs Free Energy and Spontaneity. Includes formulas and examples.

The students discover the basics of heat transfer in this activity by constructing a constant pressure calorimeter to determine the heat of solution of potassium chloride in water. They first predict the amount of heat consumed by the...

Students act as engineers to learn about the strengths of various epoxy-amine mixtures, and observe the unique characteristics of different mixtures of epoxies and hardeners. Student groups make and optimize thermosets by combining two...

In this activity, students use knowledge of specific heat capacity to mix together hot coffee and cold milk to create a solution of coffee at a desired temperature. In this randomized problem, each student is given a different final...

Determine the heat of solution for various salts.

Based on information from Part 1 of the Hot/Cold Pack Problem, design a hot/cold pack.

This activity provides a demonstration of Hess's Law using three reactions: the solubility NaOH in water, the solubility NaOH in HCl, and the reaction of a solution of HCl and a solution of NaOH.

Measure and compare the heat capacity of an unknown liquid with an unknown density.

In this part of the MRE scenario, students create solutions that when mixed, increase to a certain temperature.

At this site, the student can find out thermophysical properties of different fluids and gases.

Provides a Java applet that shows the change in energy of a bonded and a non-bonded atom.

This site provides an excellent overview of the solution process. Content includes a focus on how a solution is formed, energy changes and solution formation, spontaneity and disorder, and solution formation and chemical reactions.