Introduction to Chemical Reactions

Topics: Redox, Hydrogen, Solubility Pages: 3 (1479 words) Published: November 6, 2014
Laboratory 4. Introduction to Chemical Reactions Introduction This laboratory will introduce you to a variety of chemical reactions. You will observe precipitation reactions, acid-base reactions, oxidation-reduction reactions and reactions in which complex ions are formed. You will gather information about known compounds to help you deduce the identity of an unknown compound. In precipitation reactions, two substances, one insoluble (a precipitate) and one soluble form in what is called an exchange reaction. Precipitation Reactions occur when cations and anions of aqueous solutions combine to form an insoluble ionic solid, called a precipitate. Whether or not such a reaction occurs can be determined by using the solubility rules for common ionic solids. Since not all aqueous reactions form precipitates, one must consult the solubility rules before determining the state of the products and writing a net ionic equation. Being able to predict these reactions allows scientists to calculate what ions are present in a solution, and allows industries to form chemicals by extracting certain elements from these reactions. In an exchange reaction, the cation from one solution combines with the anion in the second solution to form a precipitate. Exchange reactions have the following general form Oxidation-reduction reactions (or redox) reactions, are a type of chemical reaction that involves a transfer of electrons between two species. An oxidation-reduction reaction is any chemical reaction in which the oxidation number of a molecule, atom, or ion changes by gaining or losing an e-. They occur every day and are vital to some of the basic functions of life. Oxidation-reduction reactions are very common in nature rusting and other types of corrosion are typical examples. Simply defined, a redox reaction is a chemical reaction...
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