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Modules Open College - e-Learning Content Library
Types of Reactions
This model illustrates the various types of chemical reactions that exist in nature. Specify the type of reaction you would like to observe, and press "Start". You will have an opportunity to choose from a variety of reactions in the main window of the mode. Equations describing the chemical processes will be presented in the window that is located just below.

If you choose sequential reactions, you will observe the conventional chemical reactions. The product of the first reaction becomes the initial substance of the reaction that follows it. If you choose to view parallel reactions, you will observe the one and the same substance interacting with different ingredients simultaneously, and producing different byproducts.

In chain reactions, you will observe a chemical substance absorb a quantum of energy, which will result in the molecule of the initial substance to dissipate into two radicals. The radicals then proceed to "attack" the molecules of another substance. Each one of these molecules gives away one atom to form a combined molecule with the radical, while the other atom of the dissipated molecule remains with the radical as well; and so, the chain reaction continues. In photochemical reactions, each molecule of one of the initial substances absorbs a quantum of light, which propels it to an excited state. While in the excited state, the molecules are capable of interacting with other substance as well as dissipating. Finally, consider the catalytic reactions. Generally, in the absence of a catalyst, reactions tend to be slow, or even impossible. The presence of a catalyst drastically changes the nature of the reaction. Molecules of one of the initial substances readily combine with the catalyst, and then the molecules of the second initial substance interact with this complex. As the final product is being formed, the catalyst detaches from the compound, and becomes available for participating in new reactions.

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