Discussion6 - Lauren Taranow Unique 51070 lmt827 Discussion...

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Lauren Taranow lmt827 10-22-11 Unique: 51070 Discussion - Experiment 6: The Reactions of a Copper Cycle The objective of this experiment was to observe and record reactions in a copper cycle, and to determine each type of reaction that occurs. During the first reaction, a 0.4748 g copper wire was mixed with about 6.0 mL of 16.0 M HNO 3 under a fume hood, because poisonous nitrogen dioxide gas is emitted during the reaction between the two substances. When HNO3 was first added, the solution turned yellow/green and emitted yellow nitrogen dioxide gas. After swirling the beaker, the solution underwent another physical change and turned into a blue color, still emitting gas, showing that this reaction if exothermic. After about five minutes, the copper was completely dissolved and water was added to make the total volume of the light blue solution150 mL. Next, 30.0 mL of 3.0 M NaOH was mixed into the solution, and the solution physically changed into a bright, opaque blue. The lack of transparency in the solution showed that a precipitate was formed, a chemical change from aqueous copper and hydroxide ions to solid copper(II) hydroxide. Next, an endothermic reaction took place, meaning heat was added to the
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This note was uploaded on 04/02/2012 for the course CH 101 taught by Professor Sutcliffe during the Spring '08 term at University of Texas.

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Discussion6 - Lauren Taranow Unique 51070 lmt827 Discussion...

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