ChemChanges - Investigating Chemical Changes Chemical...

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Investigating Chemical Changes & Chemical Equation Writing Objective: The purpose of this experiment is to demonstrate different types of chemical reactions and to write balanced chemical equations for chemical reactions. Safety Tips: Wear safety goggles at all times in the laboratory. HANDLE ALL SOLUTIONS WITH CAUTION. If acid and/or base is spilled on the counter top, clean it up immediately. IF A CHEMICAL IS SPILLED ON THE SKIN, IMMEDIATELY RINSE THE AREA WITH LARGE AMOUNTS OF WATER. Dispose of all solutions per instructor's directions. Be careful with SILVER NITRATE (AgNO 3 ) solution. Silver nitrate will turn your skin brown/black; the color will come off with time. Report any spill to your instructor. Background: The periodic table contains over 100 elements and chemical literature describes millions of compounds that are known. Some of these compounds are isolated from natural sources and some are synthesized in the laboratory. Combinations of chemicals, whether from natural sources or the laboratory setting, involve chemical reactions. The change in the way that matter is composed is a chemical reaction, a process wherein reactants (or starting materials) are converted into products. The new products have properties and characteristics that are different from those of the reactants. There are many different chemical reactions, but four common types are: combination, decomposition, single replacement (substitution), or double displacement (metathesis). A combination reaction involves elements or simple compounds forming a more complex product. This process may be described by the general formula: AB B A + The rusting of iron or the combination of iron and sulfur are good examples. ) ( ) ( 2 ) ( 3 ) ( 4 3 2 2 rust s O Fe g O s Fe + ) ( ) ( ) ( s FeS s S s Fe + A decomposition reaction involves a reacting substance breaking down into elements or simpler compounds. This reaction has the general formula: B A AB +
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The electrolysis of water into hydogen and oxygen is an example of a decomposition reaction. ) ( ) ( 2 ) ( 2 2 2 2 g O g H l O H + A single replacement or substitution reaction involves one element taking the place of another element in a compound. This reaction has the general formula: A CB C AB + + Processes which involve oxidation (the loss of electrons) and reduction (the gain of electrons) are typical of
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This note was uploaded on 07/29/2010 for the course SCI none taught by Professor None during the Spring '10 term at Armstrong State University.

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ChemChanges - Investigating Chemical Changes Chemical...

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