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Matthew Sandberg and Mike Bellamy
Chemistry Department, Northwest Missouri State University, Maryville, MO 64468

This equilibrium applet is designed not only to help students learn to solve equilibrium calculations, but also to help them gain a deeper understanding of the topic. The authors began by compiling a list of different aspects of chemical equilibrium that they wanted to address. It was their belief that the targeted aspects of chemical equilibrium could be taught effectively using a visual approach. Consequently, this applet allows students to add colored balls to a reaction chamber. Each ball represents 0.5 moles of N₂, H₂, or NH₃. Clicking the “equilibrate” button displays the equilibrium concentrations of each gas in a chamber that is next to the initial chamber. Thus, students can see the number of each colored ball that is present initially and after equilibrium concentrations have been reached. Students can vary the starting concentrations of any of the gases. They can also change the value of the equilibrium constant by changing the temperature of the system. The initial and equilibrium concentrations of each gas are given in an equilibrium table. The value of “x” that would be obtained by solving the equilibrium constant expression is also listed. The applet can be used by the instructor in the classroom as the topics are introduced. Sample exercises for students are included.

The text of the applet is given in English and in Spanish.

Figure. Screen from Equilibrium

	Run: Equilibrium	HTML, Shockwave
	Documentation HTML, PDF	HTML, PDF
	Student exercises English, Spanish	HTML
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